Muwatta Imam Malik (Riwayat Ibn al-Qasim)

It is narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Our Lord, Blessed and Exalted, descends to the lowest heaven every night in the last third of the night and says: Who is there who supplicates to Me so that I may answer his supplication? Who is there who asks of Me so that I may give to him? Who is there who seeks forgiveness from Me so that I may forgive his sins?"