Ibn Abi Umayr also narrated this to me]: Ibn Abi Ya`fur and Mu`alla b. Khunays were travelling by the Nile in the time of Abi Abdillah عليه السلام when they differed over eating the meat slaughtered by Jews. Mu`alla ate it but Ibn Abi Ya`fur did not. They informed Abi Abdillah عليه السلام of this when they met him, he was pleased with what Ibn Abi Ya`fur had done and rebuked al-Mu`alla for eating it.