Night prayer is two by two

Pray the night prayer in pairs, then one rak'ah of Witr before dawn.

Narrated by Abdullah ibn Umar

A man asked the Prophet ﷺ about the night prayer. He said: "The night prayer is two by two. When one of you fears the coming of dawn, let him pray one rak'ah, making Witr for what he has prayed."

Sahih al-Bukhari 990, Sahih Muslim 749

What this hadith teaches

Tahajjud is prayed two rak'ahs at a time and closed with an odd number.

Reference and grade

Grade
Sahih: agreed upon by al-Bukhari and Muslim
Narrator
Abdullah ibn Umar

The hadith in Arabic نص الحديث

صَلاَةُ اللَّيْلِ مَثْنَى مَثْنَى، فَإِذَا خَشِيَ أَحَدُكُمُ الصُّبْحَ صَلَّى رَكْعَةً وَاحِدَةً، تُوتِرُ لَهُ مَا قَدْ صَلَّى

Arabic text of Sahih al-Bukhari 990, as given on sunnah.com.