The Messenger of Allah ﷺ said, "Allah grants respite until half or two-thirds of the night has passed, then He says, 'Let none of My servants ask anyone other than Me. Whoever calls upon Me, I will answer him. Whoever asks of Me, I will give him. Whoever seeks My forgiveness, I will forgive him.' This continues until dawn breaks."
حدثنا أبو بكر بن أبي شيبة حدثنا محمد بن مصعب عن الأوزاعي عن يحيى بن أبي كثير عن هلال بن أبي ميمونة عن عطاء بن يسار
قال رسول الله ﷺ إن الله يمهل حتى إذا ذهب من الليل نصفه أو ثلثاه قال لا يسألن عبادي غيري من يدعني أستجب له من يسألني أعطه من يستغفرني أغفر له حتى يطلع الفجر
No references are available.
Sourcing, sahih. Ahmad reported it, 4/16, with a sahih chain of transmission from Yahya, through this route, and he stated explicitly that he heard it directly, as recorded by Ajurri in Shariah and elsewhere. The hadith has corroborating narrations in Muslim, no. 758, and elsewhere.