The Messenger of Allah ﷺ said, "When the last third of the night remains, Allah descends to the lowest heaven. Then the gates of heaven are opened, and He extends His hand and says, 'Is there anyone who asks, that he may be given what he asks for?' He continues in this way until dawn breaks."
حدثنا عبد الصمد حدثنا عبد العزيز بن مسلم حدثنا أبو إسحاق الهمداني عن أبي الأحوص
أن رسول الله ﷺ قال إذا كان ثلث الليل الباقي يهبط الله عز وجل إلى السماء الدنيا ثم تفتح أبواب السماء ثم يبسط يده فيقول هل من سائل يعطى سؤله فلا يزال كذلك حتى يطلع الفجر
Its isnad is sahih. Abu Ishaq Hamdani is Subayi, Amr bin Abdullah.The hadith is found in Majma al-Zawaid 10:153, where it says, "Ahmad and Abu Yaala related it, and their narrators are the narrators of sahih hadith."The meaning of the hadith is established from the hadith of Abu Hurairah, related by the authors of the six books and others. See our commentary on Tirmidhi 2:307-309.