It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that the Holy Prophet (peace and blessings be upon him) said: When one third of the night passes, Allah Almighty descends to the lowest heaven and announces: I am the True King. Who is there who asks of Me so that I may grant him? Who is there who supplicates to Me so that I may accept his supplication? Who is there who seeks forgiveness from Me so that I may forgive him? This announcement continues until the break of dawn.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 7792