"There are four things which the Prophet never gave up: Fasting 'Ashura', (fasting during) the ten days, (fasting) three days of each month, and praying two Rak'ahs before Al-Ghadah (Fajr)."
Sunan an-Nasa'i Book 22, Hadith 327
← Previous Hadith "I entered upon the Mother of the Believers and heard her say: 'The Messenger of Allah used to fast three days of each month: The first Monday of the month, then Thursday, then the following Thursday."

Sunan an-Nasa'i Book 22, Hadith 326 Next Hadith → the Messenger of Allah used to fast nine days of Dhul-Hijjah, the day of 'Ashura', and three days of each month: The first Monday of the month, and two Thursday.

Sunan an-Nasa'i Book 22, Hadith 328