Narrated Ibn `Umar:
Once a person asked Allah's Messenger (ﷺ) (ﷺ) about the night prayer. Allah's Apostle (ﷺ) replied, "The night prayer is offered as two Rak`at followed by two Rak`at and so on and if anyone is afraid of the approaching dawn (Fajr prayer) he should pray one Rak`ah and this will be a Witr for all the Rak`at which he has prayed before."
Reference | : Sahih al-Bukhari 990 |
In-book reference | : Book 14, Hadith 1 |
USC-MSA web (English) reference | : Vol. 2, Book 16, Hadith 105 |
(deprecated numbering scheme) |