On the authority of Abu Hurayrah (may Allah be pleased with him), who said that the Messenger of Allah (PBUH) said:

"Our Lord (glorified and exalted Is He) descends each night to the earth's sky when there remains the final third of the night, and He says:

{Is there anyone saying a prayer to Me, that I may answer it?

Is there anyone asking something of Me, that I may give it him?

Is there anyone asking forgiveness of Me, that I may forgive him?}"

Related by al-Bukhaari (also by Muslim, Maalik, at-Tirmizhi and Abu Dawood).

In a version by Muslim the Hadeeth ends with the words:

"And thus He continues till [the light of] dawn shines."