Musnad Ahmad 30:504

'Abd al-Razzaq narrated to us, Ma'mar narrated to us, from al-Zuhri, who said: Abu Salamah ibn 'Abd al-Rahman and al-Agharr, the companion of Abu Hurayrah, informed me that Abu Hurayrah informed them, from the Messenger of Allah (may Allah bless him and grant him peace), who said: "Our Lord, Blessed and Exalted is He, descends every night, when the last third of the night remains, to the lowest heaven, and He says: 'Who is calling upon Me, that I may answer him? Who is seeking My forgiveness, that I may forgive him? Who is asking of Me, that I may give to him?'"