Sayyiduna Anas bin Malik (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings of Allah be upon him) said: Whoever forgets to pray a prayer or sleeps through it, its expiation is only that he should pray it when he remembers it.

Abu Huraira (may Allah be pleased with him) narrates that we camped with the Messenger of Allah (peace and blessings be upon him) in the last part of the night, and it was the heat of the sun that woke us up. The Prophet (peace and blessings be upon him) said: "Let every person take hold of his camel's rein and move from this place." Then he asked for water, performed ablution, and offered two units of prayer (Sunnah). Then the Iqamah was pronounced and the obligatory prayer was performed.