(81) باب صَوْمِ ثَلاَثَةِ أَيَّامٍ مِنَ الشَّهْرِ
Abu Hurairah said:
"The Messenger of Allah commanded me to pray two Rakahs of Duah,nt to sleep until after praying Witr and to fast three days of each month. (Sahih). (FR)
Reference (FR): Sunan an-Nasa'i 2406 (FR)
In-book reference (FR): Book 22, Hadith 317 (FR)
English translation (FR): Vol. 3, Book 22, Hadith 2408 (FR)