This hadith has been reported on the authority of Abu Bakr b. Abu Shaiba and Abu Kuraib, and both of them said:Abu Mu'awiya narrated to us from A'mash on the authority of Jarir and Waki', and in a narration of Abu Bakr transmitted on the authority of Abu Mu'awiya the mention of Mu'adh has preceded Ubayy's, and in the narration transmitted on the authority of Abu Kuraib, the name of Ubayy preceded Mu'ddh's