From Sahih Bukhari (Hadith 1145):
Narrated Abu Huraira:Allah's Messenger (ﷺ) said, "Our Lord, the Blessed, the Superior, comes every night down on the nearest Heaven to us when the last third of the night remains, saying: "Is there anyone to invoke Me, so that I may respond to invocation? Is there anyone to ask Me, so that I may grant him his request? Is there anyone seeking My forgiveness, so that I may forgive him?
Reference: Bukhari 1145