Abu al-Zubayr narrates: I asked Sayyiduna Jabir (may Allah be pleased with him) about the Pledge of al-Aqabah. He said that seventy men were present at it; they made a covenant with the Prophet (peace and blessings be upon him), and Sayyiduna al-Abbas bin Abd al-Muttalib (may Allah be pleased with him) was holding the hand of the Prophet (peace and blessings be upon him). The Prophet (peace and blessings be upon him) said: "I have taken and I have given (that is, the matter is settled)."
Ahmad recorded it; its chain contains a narrator, Ibn Lahi'ah, whose hadith is hasan (good), though there is weakness in him.