Musnad Abi Ya'la 6576 — the Messenger of Allah ﷺ said: Were it not

It is narrated from Sayyiduna Abu Hurayrah and Sayyiduna Ali (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "Were it not that I feared hardship for my Ummah, I would have delayed the Isha prayer until a third of the night, for when the first third of the night has passed, Allah, the Mighty and Majestic, descends to the lowest heaven and remains there until dawn breaks, saying: 'Is there anyone who repents (so that his repentance may be accepted)? Is there anyone who asks, so that he may be given? Is there anyone who calls, so that his supplication may be answered? Is there any sinner who seeks forgiveness, so that he may be forgiven? Is there anyone sick who seeks cure, so that he may be cured?'"