The Messenger of Allah ﷺ as saying: Our Lord who is blessed and exalted descends every night to the lowest heaven when the last one-third of the night remains, and says: Who supplicated Me so that I may answer him ? Who asks of Me so that I may give to him ? Who asks My forgiveness so that I may forgive him ? (Using translation from Abū Dāʾūd 1315)
قَالَ رَسُولُ اللهِ ﷺ يَنْزِلُ رَبُّنَا تَبَارَكَ اسْمُهُ كُلَّ لَيْلَةٍ حِينَ يَبْقَى ثُلُثُ اللَّيْلِ الْآخِرُ إِلَى السَّمَاءِ الدُّنْيَا فَيَقُولُ مَنْ يَدْعُونِي فَأَسْتَجِيبَ لَهُ؟ مَنْ يَسْأَلُنِي فَأُعْطِيَهُ؟ مَنْ يَسْتَغْفِرُنِي فَأَغْفِرَ لَهُ؟ حَتَّى يَطْلُعَ الْفَجْرُ فَلِذَلِكَ كَانُوا يُفَضِّلُونَ صَلَاةَ آخِرِ اللَّيْلِ عَلَى صَلَاةِ أَوَّلِهِ