(70) باب صَوْمِ النَّبِيِّ صلى الله عليه وسلم - بِأَبِي هُوَ وَأُمِّي - وَذِكْرِ اخْتِلاَفِ النَّاقِلِينَ لِلْخَبَرِ فِي ذَلِكَ
It was narrated that 'Abdullah bin Masud said:
"The Messenger of Allah used to fast three days in the middle of every month, and he rarely did not fast on Friday." (ES)
Reference (ES): Sunan an-Nasa'i 2368 (ES)
In-book reference (ES): Book 22, Hadith 279 (ES)
English translation (ES): Vol. 3, Book 22, Hadith 2370 (ES)