Muslim narrated on the authority of Muadh that she asked Aisha whether the Messenger of God, may God bless him and grant him peace, used to fast three days every month. She said yes, so I told her which days of the month he fasted. She said he did not care which days of the month he fasted.

Know that every month that is referred to a person is weak and is responded to from the side of the truth, so a person must fulfill his right called hospitality, which is weak, and the right of summer is three days. Therefore, the Lawgiver legislated in the law that is recommended for three days of every month, and we wanted to Firstly, we said: We fast that on the three days, but it is not the same because the law stated that hastening food for the weak, so he said: haste is from Satan, except in three cases, and he mentioned feeding the guest, and the Messenger of God, may God bless him and grant him peace, used to fast three days from the beginning of every month. Al-Nasa’i n