It is narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that he said: When the Messenger of Allah (peace and blessings be upon him) arrived in Madinah, he (peace and blessings be upon him) established brotherhood (mu'akhah) among his Companions. Then Sayyiduna Ali (may Allah be pleased with him) came with tears flowing from his eyes and said: O Messenger of Allah! You have established brotherhood among all your Companions, but you have not established brotherhood between me and anyone. So the Messenger of Allah (peace and blessings be upon him) said: "O Ali! You are my brother in this world and the Hereafter." Salim bin Abi Hafsah has also corroborated this narration from Jumay', with some addition in its wording.

It is narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) established brotherhood among his Companions. He (peace and blessings be upon him) made brothers of Sayyiduna Abu Bakr and Sayyiduna Umar (may Allah be pleased with them both), of Sayyiduna Talhah and Sayyiduna al-Zubayr (may Allah be pleased with them both), and of Sayyiduna Uthman bin Affan and Sayyiduna Abd al-Rahman bin Awf (may Allah be pleased with them both). Then Sayyiduna Ali (may Allah be pleased with him) said: O Messenger of Allah! You have established brotherhood among your Companions, so who is my brother? The Messenger of Allah (peace and blessings be upon him) said: "O Ali! Are you not pleased that I should be your brother?" Ibn Umar (may Allah be pleased with them both) said: Sayyiduna Ali (may Allah be pleased with him) was very strong and brave. Sayyiduna Ali (may Allah be pleased with him) said: Of course, O Messenger of Allah! So the Messenger of Allah (peace and blessings be upon him) said: "You are my brother in this world and the Hereafter."