(20) باب فِي فَضْلِ الْقُعُودِ فِي الْمَسْجِدِ
Abu Hurairah reported the Messenger of Allah (May peace be upon him) as saying; The angels invoke blessings on any of you who remains sitting at the place where he says his prayers so long as he is defiled (needs ablution) or stands up, saying:
O Allah, forgives him; O Allah, have mercy on him.
Reference: Sunan Abi Dawud 469
In-book reference: Book 2, Hadith 79
English translation: Book 2, Hadith 469