‘Umm al-Mu’minin Aisha Siddiqa (may Allah be pleased with her) says that one night (while returning from a battle) on the way to Madinah, the eyes of the Messenger of Allah (peace and blessings be upon him) opened and he could not sleep, so he (peace and blessings be upon him) said: “I wish that someone from among my companions, a fortunate one, would guard me throughout the night.” Umm al-Mu’minin Aisha Siddiqa (may Allah be pleased with her) says that just then we heard the sound of weapons, so the Messenger of Allah (peace and blessings be upon him) said: “Who is it?” A voice replied: “O Messenger of Allah! It is Sa’d bin Abi Waqqas.” The Messenger of Allah (peace and blessings be upon him) said: “Why have you come?” He replied: “I felt fear for the Messenger of Allah (peace and blessings be upon him) within myself, so I have come to guard you.” Thus, the Messenger of Allah (peace and blessings be upon him) prayed for him and then slept.