Dialects and Readings of the Qur'an (Kitab Al-Huruf Wa Al-Qira'at)
Dawud :: Book 30 : Hadith 3988
Narrated AbuSa'id al-Khudri:
The Apostle of Allah (peace_be_upon_him) mentioned the name of the one who will sound the trumpet (sahib as-sur) and said: On his right will be Jibra'il and on his left will be Mika'il.