An-Nu'man bin Sa'd narrated: "A man asked Ali: "Which month do you order me to fast after the month of Ramadan?' He said to him, 'I have not heard anyone ask this except for a man whom I heard asking the Messenger of Allah while I was sitting with him. He said: "O Messenger of Allah! Which month do you order me to fast after the month of Ramadan?" He said: "If you will fast after the month of Ramadan, then fast Al-Muharram, for indeed it is Allah's month in which there is a day that Allah accepted the repentance of a people, and in which He accepts the repentance of other people."

Abu Ghalib says that Abu Umamah (may Allah be pleased with him) saw the heads of the slain Khawarij of Harura hanging on the steps of the mosque of Damascus, so he said: "These are the dogs of Hell, the worst of those killed under the canopy of the sky, while the best of those killed are those whom they killed." Then he recited this verse «يوم تبيض وجوه وتسود وجوه» 1. I said to Abu Umamah (may Allah be pleased with him): "Did you hear this from the Messenger of Allah (peace and blessings be upon him)?" He said: "If I had not heard it from him once or twice or three times or four times"—and he counted up to seven—"I would not have narrated it to you." Imam Tirmidhi says:
1- This hadith is Hasan (good).
2- It is said about Abu Ghalib that his name is Hazur.
3- And the name of Abu Umamah Bahili (may Allah be pleased with him) is Suda'i bin 'Ajlan; he was the chief of the tribe of Bahila.