(24) باب التَّرْغِيبِ فِي الدُّعَاءِ وَالذِّكْرِ فِي آخِرِ اللَّيْلِ وَالإِجَابَةِ فِيهِ
Abu Huraira reported Allah's Messenger (ﷺ) as saying:
Allah descends every night to the lowest heaven when one-third of the first part of the night is over and says: I am the Lord; I am the Lord: who is there to supplicate Me so that I answer him? Who is there to beg of Me so that I grant him? Who is there to beg forgiveness from Me so that I forgive him? He continues like this till the day breaks.
Reference: Sahih Muslim 758 b
In-book reference: Book 6, Hadith 202
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 1657