Narrated `Abdullah bin `Umar: A man said, "O Allah's Apostle! How is the prayer of the night?" He said, "Two rak`at followed by two rak`at and so on, and when you apprehend the approaching dawn, offer one rak`a as witr."
Hadith ReferenceSahih Bukhari / The Book of Salat-Ut-Tahajjud (Night Prayer) / Hadith: 1137
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة