Musannaf Ibn Abi Shayba 33:309

Abu Mu'awiyah narrated to us, from al-A'mash, from Shamir ibn 'Atiyyah, from Mughirah ibn Sa'd ibn al-Akhram, from his father, who said: Abdullah said: "By the One besides whom there is no god, it does not harm a servant who wakes up upon Islam and ends his day upon it, whatever may have befallen him of the world."