"The Messenger of Allah used to fast Thursday and Monday of each month, and Monday of the following week."
Sunan an-Nasa'i Book 22, Hadith 277
← Previous Hadith "The Messenger of Allah used to fast three days of every month: the Monday and Thursday of the first week and the Monday of the following week."

Sunan an-Nasa'i Book 22, Hadith 276 Next 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