In the name of Allah most gracious most merciful
Assalaamu alaykum wa rahmatuallahi wa barakatuhu
Ahmad ibn Shu'aib an-Nasa'i (r.a) - [215 - 303 A.H.]
Imam an-Nasa'i was born in the town of Nasa' in the Persian province of Khorasan. After gaining hadith from the teachers his own city, Imam an-Nasa'i travelled through Khorasan, Iraq, the Hijaz Syria and Egypt gaining ahadith. Egypt was where Imam an-Nasa'i settled and established his center for teaching and studies here.
Imam an-Nasa'i was said to have exhausted many of his days and nights in prayers, repeatedly performed Hajj and also joined the Muslim army to participate in battle. He was very particular of the Sunnah of the Prophet (pbuh), had a hatred for deviation and avoided the circles of kings and nobles.
Ibn Khallikan writes 'He was the Imam of hadith of his age.'
Daraqutni says 'He was more distinguished than all the muhaddithun of his time.'
He is well known for Sunan an-Nasa'i which is a collection of 5751 sound ahadith. In it he also describes the flaws of a hadith, exposes any disagreements on the title, names and kunyat of narrators and clarifies the variations between different versions of a hadith.
His teachers are many, the first being Muhaddith Qutaibah ibn Sa'id al Balkhi. Some others are Ishaq ibn Rahawaih, Muhammad ibn Nasr, Muhammad ibn Bishr and the famous Abu Dawud.
His students came from all over the Muslim world, and some of the more famous of them are Ali ibn Jafar at-Tahawi, Abul Qasim at-Tabrani, Muhammad ibn Mu'awiyah al Andalusi, Abu Jafar at-Tahani and also his own son.
Imam an-Nasa'i travelled to Damascus, Syria in 302 A.H. where he noticed people displaying some hostility towards Hazrat Ali (R.A). He therefore wrote a book to honor the character of Hazrat Ali (R.A) and started lecturing from it in a Masjid. He had only read a few lines when he was accused of being a Shi'i and was beaten badly by a crowd, such he received severe injuries to his body. In this state he requested some admirers to take him to Makkah, and it was after reaching Makkah Imam an-Nasa'i passed away.
Allah knows best