Al-Matalib al-'Aliyah 367 — The virtue of keeping to the mosque

It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "The best ribat (that is, guarding in the path of Allah and steadfastness in the religion) is waiting for one prayer after another and keeping to the gatherings of remembrance. And there is no servant who, after offering the prayer, remains sitting in his place of prayer, except that the angels continue to supplicate for good and forgiveness for him until he loses his ablution or gets up from there."
The chain of this hadith contains the narrator Muhammad bin Abi Humayd al-Madani, who is da'if (weak); however, there are supporting witnesses in other sahih hadith about waiting for the prayer and the angels seeking forgiveness.