Musannaf Ibn Abi Shaybah 39890 — Reports on the Night of Aqabah

It is narrated from Amir that the first to give allegiance under the tree was Sayyiduna Abu Sinan al-Asadi Wahb (may Allah be pleased with him). He came into the presence of the Prophet (peace and blessings be upon him) and said: "I give allegiance to you." He (peace and blessings be upon him) asked: "On what do you give allegiance to me?" Abu Sinan said: "On what is in your heart." The narrator said: So he (peace and blessings be upon him) accepted his allegiance. The narrator said: Then another man came to him (peace and blessings be upon him) and said: "I give allegiance to you on what Abu Sinan gave allegiance." So he also gave allegiance to him (peace and blessings be upon him). Then the rest of the people gave allegiance to him (peace and blessings be upon him).