´It was narrated that Abu Hurairah said:` "My dearest friend advised me (to do) three things: 'To sleep after praying Witr, to fast three days each month, and to pray two rak'ahs of Fajr.'"
Hadith Referenceسنن نسائي / كتاب قيام الليل وتطوع النهار / 1678
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:متفق عليه