"The Messenger of Allah used to fast three days in the middle of every month, and he rarely did not fast on Friday."
Sunan an-Nasa'i Book 22, Hadith 279
← Previous Hadith "When the Messenger of Allah would lie down, he would place his right hand under his right cheek, and he used to fast on Mondays and Thursday."

Sunan an-Nasa'i Book 22, Hadith 278 Next Hadith → "The Messenger of Allah commanded me to pray two Rakahs of Duha, and not to sleep until I had prayed witr, and to fast three days each month."

Sunan an-Nasa'i Book 22, Hadith 280