It was narrated that ‘Abdullah (رضي الله عنه) said:

Sa’d bin Mu'adh set out to do ‘umrah and he stayed with Umayyah bin Khalaf bin Safwan. When Umayyah went to Syria and passed by Madinah, he used to stay with Sa'd... And he narrated the hadeeth, except that he said: He went back to Umm Safwan and said: Do you know what my brother the Yathribi said to me? She said: What did he say? He said: He claimed that he heard Muhammad say that he is my killer. She said: By Allah, Muhammad does not tell lies. And when they set out for Badr... And he quoted the report.