The Book of Mosques and Places of Prayer
كتاب الْمَسَاجِدِ وَمَوَاضِعِ الصَّلاَةِ
Chapter 55: Making up a missed prayer. And it is recommended to hasten to make it up
Qatada narrated on the authority of Anas b. Malik that the Messenger of Allah (ﷺ) said
He who forgets the prayer, or he slept (and it was omitted), its expiation is (only) that he should observe it when he remembers it.
Qatada reported it on the authority of Anas b. Malik that the Messenger of Allah (ﷺ) said
When any one of you omits the prayer due to sleep or he forgets it, he should observe it when he remembers it, for Allah has said:" Observe prayer for remembrance of Me."