´It was narrated from 'Abdullah bin 'Umar that:` The Messenger of Allah (ﷺ) said: "Prayer at night is two by two, then when you want to finish, pray one rak'h which will make the total number that you prayed odd."
Hadith ReferenceSunan an-Nasa'i / The Book of Qiyam Al-Lail (The Night Prayer) and Voluntary Prayers During the Day / Hadith: 1693
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:صحيح بخاري