(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." (DE)
Reference (DE): Sunan an-Nasa'i 2368 (DE)
In-book reference (DE): Book 22, Hadith 279 (DE)
English translation (DE): Vol. 3, Book 22, Hadith 2370 (DE)