678/878- From Aisha: The Prophet, peace be upon him, was unable to sleep one night, so he said: "If only a righteous man from my companions would come to guard me tonight." Then we heard the sound of weapons, so he said: "Who is this?" He said: Sa'd, O Messenger of Allah! I have come to guard you. So the Prophet, peace be upon him, slept until we heard his snoring.