Sayyiduna Ja'far bin Abi Talib (may Allah be pleased with him) narrates: The Negus asked him: "What is your religion?" Sayyiduna Ja'far (may Allah be pleased with him) replied: "A Messenger has been sent to us whose speech, truthfulness and faithfulness we know. He invited us to worship Allah Almighty alone and not to associate anyone with Him, and to dissociate ourselves from what our people worship and what others worship besides Allah Almighty. He commands us to do good and forbids us from evil. He commands us to pray, to fast, to give charity and to maintain the ties of kinship, and he invites us to what we recognise as good. He recites to us verses of the Qur'an that have come from Allah Almighty, and there is no speech like it. So we affirmed this Prophet and believed in him, and we came to know that what he has brought is the truth from Allah Almighty. At that point we separated from our people. They began to torment us and treated us with oppression. When the situation went beyond what we could bear and we were unable to protect ourselves from them, we came out to your land, and we chose you over others." The Negus said: "Go; you will live in my land in safety. Whoever speaks ill of you will be fined."
Al-Tabarani recorded it through two routes from Ibn Ishaq, and he is a mudallis.