Musnad Ahmad 1034:151

Mu'ammal narrated to us, Sufyan narrated to us, from 'Asim, from Zirr, from Hudhayfah, who said: "Bilal used to come to the Prophet, may Allah bless him and grant him peace, while he was eating Suhur." And I could see the places where my arrows landed. I said: "After the morning (dawn)?" He said: "After the morning, except that the sun had not risen."