(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). (PT)
Reference (PT): Sunan an-Nasa'i 2406 (PT)
In-book reference (PT): Book 22, Hadith 317 (PT)
English translation (PT): Vol. 3, Book 22, Hadith 2408 (PT)