A man said, "O Messenger of Allah ﷺ! How is the prayer of the night?" He said, "Two rakʿat followed by two rakʿat and so on, and when you apprehend the approaching dawn, offer one rakʿa as witr."
يَا رَسُولَ اللَّهِ كَيْفَ صَلاَةُ اللَّيْلِ قَالَ مَثْنَى مَثْنَى فَإِذَا خِفْتَ الصُّبْحَ فَأَوْتِرْ بِوَاحِدَةٍ