"The Messenger of Allah enjoyed three things upon me: To sleep after praying Witr, to perform Ghusal on Friday, and to fast three days of each month." (Sahih).
Sunan an-Nasa'i Book 22, Hadith 316
← Previous Hadith "My beloved Prophet advised me to do three things which I will never give up, if Allah wills. He advised me to pray Duha, to pray Witr before sleeping, and to fast three days of each month."

Sunan an-Nasa'i Book 22, Hadith 315 Next Hadith → "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).

Sunan an-Nasa'i Book 22, Hadith 317