the Messenger of Allah said: "The most virtuous fasting after the month of Ramadan is Allah's month Al-Muharram."
Jami` at-Tirmidhi Book 8, Hadith 59
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"I could not find the Messenger of Allah one night. So I left and found him at Al-Baqi. He said: 'Did you fear that you had been wronged by Allah and His Messenger?' I said: 'O Messenger of Allah! I thought that you had gone to one of your wives.' So he said: 'Indeed Allah, Mighty and Sublime is He, descends to the lowest Heavens during the night of the middle of Sha'ban, to grant forgiveness to more than the number of hairs on the sheep of (Banu) Kalb.'"
Jami` at-Tirmidhi Book 8, Hadith 58 Next Hadith → "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."
Jami` at-Tirmidhi Book 8, Hadith 60
Jami` at-Tirmidhi Book 8, Hadith 58 Next Hadith → "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."
Jami` at-Tirmidhi Book 8, Hadith 60