Abu Qatada reported God’s Messenger as saying, “There is no remissness in sleep, it is only when one is awake that there is remissness; so when any of you forgets a stated prayer or oversleeps, he should observe it when he remembers it, for God has said, ‘And observe the prayer for remembrance of Me’” (Al-Qur’an, 20:14).
Anas reported God's Messenger as saying, “If anyone forgets a stated prayer or oversleeps, expiation is made by observing it when he remembers it.” A version has “That is the only expiation for it.”
He also reported God’s Messenger as saying, “If any of you performs a sajda of the afternoon prayer before sunset, he should complete his prayer; and if he is present at a sajda of the Morning Prayer before sunrise, he should complete his prayer.”
