Sayyiduna Anas (may Allah be pleased with him) reports that the Prophet (peace and blessings be upon him) established brotherhood between Sayyiduna Ibn Mas'ud and Sayyiduna Zubair (may Allah be pleased with them both).

Sayyiduna Anas bin Malik (may Allah be pleased with him) says that the Messenger of Allah (peace and blessings be upon him) established brotherhood between the Quraysh and the Ansar in my house, which is in Madinah.