(70) باب صَوْمِ النَّبِيِّ صلى الله عليه وسلم - بِأَبِي هُوَ وَأُمِّي - وَذِكْرِ اخْتِلاَفِ النَّاقِلِينَ لِلْخَبَرِ فِي ذَلِكَ
It was narrated that Hafsah said:
"When the Messenger of Allah would lie down, he would place his right hand under his right cheek, and he used to fast on Mondays and Thursday." (DE)
Reference (DE): Sunan an-Nasa'i 2367 (DE)
In-book reference (DE): Book 22, Hadith 278 (DE)
English translation (DE): Vol. 3, Book 22, Hadith 2369 (DE)