On the authority of Abu Hurairah (R) who said that the Messenger of Allah (PBUH) said: Our Lord descends each night to the Earth's sky when there remains the final third of the night and He says: 'Who is saying a prayer to Me that i may answer it? Who is asking something of Me that i may give it him? Who is asking forgiveness of Me that i may forgive him?'. - Bukhari.