291 — Abū Nasr narrated to us, saying: Abū Bakr narrated to us, saying: Ahmad narrated to us, saying: Abd al-Rahmān ibn Mahdī narrated to us, saying: Hasan ibn Ayyāsh narrated to us, from Mughīra ⦗671⦘, from Ibrāhīm, who said, “For one man to ask another, ‘Are you a believer?’ is an innovation.”