Sunan Abi Dawud

Narrated AbuSa'id al-Khudri: The Messenger of Allah (ﷺ) related a tradition in which he mentioned the words ""Jibril and Mikal"" and he pronounced them ""Jibra'ila wa Mika'ila."" Abu Dawud said: Khalaf said: I did not put the pen aside from writing letters (huruf) for forty years: nothing tired me (or made me incapable of writing), even Jibril and Mika'il did not tire me