Qatada قتادة · Trials and Fierce Battles (Kitab Al-Fitan Wa Al-Malahim)

I swear by Allah, I do not know whether my companions have forgotten or have pretended to forgot. I swear by Allah that the Messenger of Allah (ﷺ) did not omit a leader of a wrong belief (fitnah)--up to the end of the world--whose followers reach the number of three hundred and upwards but he mentioned to us his name, his father's name and the name of his tribe.

Subay' ibn Khalid said: I came to Kufah at the time when Tustar was conquered. I took some mules from it. When I entered the mosque (of Kufah), I found there some people of moderate stature, and among them was a man whom you could recognize when you saw him that he was from the people of Hijaz. I asked: Who is he? The people frowned at me and said: Do you not recognize him? This is Hudhayfah ibn al-Yaman,…