The Prophet’s (peace and blessings be upon him) guidance regarding voluntary fasting

Question:
May Allah reward you. This questioner says: Shaykh, how was the guidance of the Messenger (peace and blessings be upon him) regarding fasting in the rest of the year and in the months? And did the Messenger (peace and blessings be upon him) fast frequently in the month of Muharram, the month of Allah?

Answer:
Yes, the Prophet (peace and blessings be upon him) used to fast until it was said, “He does not break his fast.” He would fast during the year until it was said, “He does not break his fast,” and he would break his fast until it was said, “He does not fast.” He would fast frequently, and he would break his fast frequently. He would fast frequently in the month of Sha'ban, and he would fast frequently in the month of Muharram. There are times when fasting is recommended (mustahabb) and its performance is emphasized, such as Sha'ban, the month of Allah, Muharram, Thursday and Friday, three days of every month, the Day of 'Arafah for those who are not performing Hajj, and the first ten days of Dhul Hijjah. Fasting on these days is recommended (mustahabb). Yes.