Abusing Prophet [pbuh]'s Companions forbidden

In the name of Allah most gracious most merciful
Assalaamu alaykum wa rahmatuallahi wa barakatuhu

Quran Confirms The Righteousness Of Companions Of Prophet Muhammad [peace be upon him]

9:100 The vanguard (of Islam) the first of those who forsook (their homes) and of those who gave them aid and (also) those who follow them in (all)
good deeds well pleased is Allah with them as are they with him: for them hath He prepared gardens under which rivers flow to dwell therein for ever:
that is the supreme felicity.

57:10 And what cause have ye why ye should not spend in the cause of Allah? For to Allah belongs the heritage of the heavens and the earth. Not equal
among you are those who spent (freely) and fought before the Victory (with those who did so later). Those are higher in rank than those who spent
(freely) and fought afterwards. But to all has Allah promised a goodly (reward) and Allah is well-acquainted with all that ye do.

48:18 Allah's Good Pleasure was on the believers when they swore Fealty to thee under the Tree: He knew what was in their hearts and He sent down
tranquillity to them and He rewarded them with a speedy Victory;

Al-asharatu Mubashshirun
the ten people that were given the glad tiddings of assurance of entering Paradise. They were Abu Bakr, Umar, Uthman, Ali, Abdur Rahman ibn Awf, Abu Ubaydah ibn al-Jarrah, Talhah ibn Ubaydullah, az-Zubayr ibn al-Awwam, Sa'd ibn Abi Waqqas, Sa'id ibn Zayd.

Sunan of Abu-DawoodHadith 4632 Narrated bySa'id ibn Zayd
AbdurRahman ibn al-Akhnas said that when he was in the mosque, a man mentioned Ali (may Allah be pleased with him). So Sa'id ibn Zayd got up and said: I bear witness to the Apostle of Allah (peace be upon him) that I heard him say: Ten persons will go to Paradise: The Prophet (peace be upon him) will go to Paradise, AbuBakr will go to Paradise, Umar will go to Paradise, Uthman will go to Paradise, Ali will go to Paradise, Talhah will go to Paradise: az-Zubayr ibn al-Awwam will go to paradise, Sa'd ibn Malik will go to Paradise, and AbdurRahman ibn Awf will go to Paradise. If I wish, I can mention the tenth. The People asked: Who is he: So he kept silence. They again asked: Who is he: He replied: He is Sa'id ibn Zayd.

Two People Will Perish On Ali [r.a] Account
Al-Tirmidhi HadithHadith 6093 Narrated byAli ibn AbuTalib
Allah's Messenger (peace be upon him) said to him, "You have a resemblance to Jesus whom the Jews hated so much that they slandered his mother and whom
the Christians loved so much that they placed him in a position not rightly his." Ali afterwards said, "Two people will perish on my account, one who
loves me so excessively that he praises me for what I do not possess, and one who hates me so much that he will be impelled by his hatred to slander
me." Ahmad transmitted it.
*Note:Shia’s excessively praised Ali r.a ,while Khawarijites hated him.

Read about --- khawarijites

Sahaba’s/Companions Of Prophets Were Religious people.
Al-Tirmidhi HadithHadith 6224 Narrated byAbuHurayrah
Allah's Messenger (peace be upon him) said, "AbuBakr is a fine man, Umar is a fine man, AbuUbaydah ibn al-Jarrah is a fine man, Usayd ibn Hudayr is a fine man, Thabit ibn Qays ibn Shammas is a fine man, Mu'adh ibn Jabal is a fine man, and Mu'adh ibn Amr ibn al-Jamuh is a fine man."
Tirmidhi transmitted it, saying this is a gharib tradition.

Annoying The Sahaba/Companions[r.a] Is Sin
Sahih Muslim HadithHadith 6097 Narrated byA'idh ibn Amr
AbuSufyan came to Salman, Suhayb and Bilal in the presence of a group of persons. They said: By Allah, the sword of Allah did not reach the neck of the enemy of Allah as it was required to reach. Thereupon AbuBakr said: Do you say this to the old man of the Quraysh and their chief? Then he came to Allah's Apostle (peace be upon him) and informed him of this. Thereupon he (the Prophet) said: AbuBakr, you have perhaps annoyed them and if you annoyed them you have in fact annoyed your Lord. So AbuBakr came to them and said: O my brothers, I have annoyed you. They said: No, our brother, may Allah forgive you!

Do Not Revile Companions
Sahih Muslim HadithHadith 6167 Narrated byAbuHurayrah
Allah's Messenger (peace be upon him) said: Do not revile my Companions, do not revile my Companions. By Him in Whose Hand is my life, if one amongst you would have spent as much gold as Uhud it would not amount to as much as one mudd on behalf of one of them or half of it.

Al-Tirmidhi HadithHadith 6092 Narrated byUmm Salamah
Allah's Messenger (peace be upon him) said, "He who reviles Ali has reviled me."
Ahmad transmitted it.

Sahih Muslim HadithHadith 7167 Narrated byAisha
Aisha said to Ibn az-Zubayr: O, the son of my sister, the Muslims were commanded to seek forgiveness for the Companions of Allah's Apostle (peace be upon him) but they reviled him.

A Man Reviled AbuBakr And The Prophet (peace be upon him) Was Sitting…
Al-Tirmidhi HadithHadith 5102 Narrated byAbuHurayrah
A man reviled AbuBakr and the Prophet (peace be upon him) was sitting showing pleasure and smiling, but when the man went on at length and AbuBakr replied to some of what he said the Prophet (peace be upon him) became angry and got up and left. AbuBakr caught up with him and said, "Messenger of Allah (peace be upon him), he was reviling me while you were sitting, but when I replied to some of what he said you became angry and got up and went away." He replied, "There was an angel with you replying to him, but when you replied to him a devil came down." He then added, "AbuBakr, there are three things all of which are true: No one is wronged and ignores it for the sake of Allah who is Great and Glorious without Allah giving him great help for it. No one begins to give intending thereby to unite ties of relationship without Allah providing him with much more because of it. And no one will begin to beg seeking thereby to gain abundance without Allah giving him still more scantiness because of it."
Ahmad transmitted it.

*Note: A man reviled AbuBakr and the Prophet (peace be upon him) was sitting showing pleasure and smiling,Prophet (peace be upon him) did not ordered that man to be killed not did he called him kafir[non-muslim].It is very sinful but it does not takes a person out of the fold of Islam.

People Abused AbuBakr ,Ali
Sunan of Abu-DawoodHadith 4350 Narrated byAbuBakr
AbuBarzah said: I was with AbuBakr. He became angry at a man and uttered hot words. I said: Do you permit me, Caliph of the Apostle of Allah (peace be upon him), that I cut off his neck? These words of mine removed his anger; he stood and went in. He then sent for me and said: What did you say just now? I said: (I had said:) Permit me that I cut off his neck. He said: Would you do it if I ordered you? I said: Yes. He said: No, I swear by Allah, this is not allowed for any man after Muhammad (peace be upon him).

Sunan of Abu-DawoodHadith 4633 Narrated bySa'id ibn Zayd ibn Amr ibn Nufayl
Rabah ibn al-Harith said: I was sitting with someone in the mosque of Kufah while the people of Kufah were with him. Then Sa'id ibn Zayd ibn Amr ibn Nufayl came and he welcomed him, greeted him, and seated him near his foot on the throne. Then a man of the inhabitants of Kufah, called Qays ibn Alqamah, came. He received him and began to abuse him. Sa'id asked: Whom is this man abusing? He replied: He is abusing Ali. He said: Don't I see that the companions of the Apostle of Allah (peace be upon him) are being abused, but you neither stop it nor do anything about it? I heard the Apostle of Allah (peace be upon him) say--and I need not say for him anything which he did not say, and then he would ask me tomorrow when I see him --AbuBakr will go to Paradise and Umar will go to Paradise. He then mentioned the rest of the tradition to the same effect (as in No. 4632). He then said: The company of one of their man whose face has been covered with dust by the Apostle of Allah (peace be upon him) is better than the actions of one of you for a whole life time even if he is granted the life-span of Noah.

Sahih Al-Bukhari HadithHadith 5.466 Narrated byHishams father
I started abusing Hassan in front of 'Aisha. She said, "Do not abuse him as he used to defend Allah's Apostle (against the infidels)." 'Aisha added, "Once Hassan took the permission from the Prophet to say poetic Verses against the infidels. On that the Prophet said, 'How will you exclude my forefathers (from that)?' Hassan replied, 'I will take you out of them as one takes a hair out of the dough.' " Hisham's father added, "I abused Hassan as he was one of those who spoke against 'Aisha."

Revenging In Abusing Each Other Is permitted.

Sunan of Abu-DawoodHadith 4880 Narrated byAisha, Ummul Mu'minin
Ibn Awn said: I asked about the meaning of intisar (revenge) in the Qur'anic verse: "But indeed if any do help and defend themselves (intasara) after a wrong (done) to them, against them there is no cause of blame." Then Ali ibn Zayd ibn Jad'an told me on the authority of Umm Muhammad, the wife of his father. Ibn Awn said: It was believed that she used to go to the Mother of the Faithful (i.e. Aisha). She said: The Mother of the Faithful said: The Apostle of Allah (peace be upon him) came upon me while Zaynab, daughter of Jahsh, was with us. He began to do something with his hand. I signalled to him until I made him understand about her. So he stopped. Zaynab came on and began to abuse Aisha. She tried to prevent her but she did not stop. So he (the Prophet) said to Aisha: Abuse her. So she abused her and dominated her. Zaynab then went to Ali and said: Aisha abused you and did (such and such). Then Fatimah came (to the Prophet) and he said to her: She is the favourite of your father, by the Lord of the Ka'bah! She then returned and said to them: I said to him such and such, and he said to me such and such. Then Ali came to the Prophet (peace be upon him) and spoke to him about that.

*Note:The details are not available in hadith to know what were the reasons for abuse,but certainly Ayesha [r.a] was right in revenging as Prophet Muhammad peace be upon him permitted her.

Sahih Al-Bukhari HadithHadith 3.856 Narrated byAnas
It was said to the Prophet "Would that you see Abdullah bin Ubai." So, the Prophet went to him, riding a donkey, and the Muslims accompanied him, walking on salty barren land. When the Prophet reached 'Abdullah bin Ubai, the latter said, "Keep away from me! By Allah, the bad smell of your donkey has harmed me." On that an Ansari man said (to 'Abdullah), "By Allah! The smell of the donkey of Allah's Apostle is better than your smell." On that a man from 'Abdullah's tribe got angry for 'Abdullah's sake, and the two men abused each other which caused the friends of the two men to get angry, and the two groups started fighting with sticks, shoes and hands. We were informed that the following Divine verse was revealed (in this concern): "And if two groups of believers fall to fighting then, make peace between them." (49.9)

Say : I Seek Refuge In Thee From The Accursed Devil
Sunan of Abu-DawoodHadith 4762 Narrated byMu'adh ibn Jabal
Two men reviled each other in the presence of the Prophet (peace be upon him) and one of them became excessively angry so much so that I thought that his nose will break up on account of excess of anger. The Prophet (peace be upon him) said: I know a phrase which, if he repeated, he could get rid of this angry feeling. They asked: What is it, Apostle of Allah? He replied: He should say: I seek refuge in Thee from the accursed devil. Mu'adh then began to ask him to do so, but he refused and persisted in quarrelling, and began to enhance his anger.

Therefore,If Shia’s Abuse sahabas ,one shold pray for their guidance and never think of killing them or calling them kafir[non-muslims].By abusing they themselves are falling into sins which will be punished unless Allah subhanawatala forgives.

Allah knows best