Abu Dharr al-Ghaffari · The Book on Fasting

the Messenger of Allah said: "O Abu Dharr! When you fast three days out of a month, then fast the thirteenth, fourteenth, and fifteenth."

"The Messenger of Allah said: 'Whoever fasts three days in every month, then that is (similar to) fasting every day.' Then Allah Mighty and Sublime is He, attested to that in His Book, by revealing: Whoever brings a good deed, shall have ten times the like thereof. So a day is like ten."

"We fasted with the Prophet, so he did not pray (the night prayer) with us until seven (nights) of the month remained. Then he (pbuh) led us in prayer until a third of the night had gone, then he did not lead us in prayer on the sixth. Then he led us in prayer on the fifth until half of the night had gone. We said to him: 'O Messenger of Allah! Wouldn't you lead us in prayer for the…