(1) باب
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. (ID)
Reference (ID): Sunan Abi Dawud 3998 (ID)
In-book reference (ID): Book 32, Hadith 30 (ID)
English translation (ID): Book 31, Hadith 3987 (ID)