(70) باب صَوْمِ النَّبِيِّ صلى الله عليه وسلم - بِأَبِي هُوَ وَأُمِّي - وَذِكْرِ اخْتِلاَفِ النَّاقِلِينَ لِلْخَبَرِ فِي ذَلِكَ
It was narrated that Hafsah said:
"The Messenger of Allah used to fast Thursday and Monday of each month, and Monday of the following week." (RU)
Reference (RU): Sunan an-Nasa'i 2366 (RU)
In-book reference (RU): Book 22, Hadith 277 (RU)
English translation (RU): Vol. 3, Book 22, Hadith 2368 (RU)