Musannaf Ibn Abi Shaybah

Hazrat Abu Hamza (may Allah have mercy on him) narrates that Hazrat Zaid bin Arqam (may Allah be pleased with him) said: The first person to accept Islam with the Messenger of Allah (peace and blessings be upon him) was Hazrat Ali (may Allah be pleased with him). Amr bin Murrah says: I went to Ibrahim (may Allah have mercy on him) and mentioned this to him, but he denied it and said: The first person to accept Islam was Hazrat Abu Bakr (may Allah be pleased with him). (