Qur'an

“They are those who spend 'a good portion of the night', prostrating themselves and standing before their Lord.”

(Qur'an 25:64)

Hadith

Abu Huraira reported: The Messenger of Allah (peace and blessings be upon him) said,

“Our Lord Almighty descends to the lowest heaven in the last third of every night, saying: Who is calling upon Me that I may answer him? Who is asking from Me that I may give him? Who is seeking My forgiveness that I may forgive him?”

Sahih Al Bukhari 1145, Sahih Muslim 758 | Muttafaqun Alayhi