Mukhtasar Bukhari

Umm al-Mu’minin Aisha Siddiqa (may Allah be pleased with her) narrates that the Prophet Muhammad (peace and blessings be upon him) did not sleep one night during a journey, so when he reached Madinah, (he was overcome by sleep). The Prophet (peace and blessings be upon him) said: “If only one of my righteous companions would guard me tonight.” Suddenly, we heard the sound of a weapon. The Prophet (peace and blessings be upon him) said: “Who is it?” He replied, “Sa’d bin Abi Waqqas. I have come to guard you, O Messenger of Allah.” Then the Prophet (peace and blessings be upon him) slept.