Mustadrak al-Hakim — Hadith 6696

It is narrated from Urwah, in the listing of the names of those Muslims of the Ansar who gave the pledge to the Messenger of Allah (peace and blessings be upon him) at the Pledge of Aqabah, that from Banu al-Harith bin al-Khazraj, Sa'd bin al-Rabi' bin Amr bin Abi Zuhayr bin Malik bin Imru' al-Qays bin Tha'labah bin Ka'b bin al-Khazraj bin al-Harith was included. He was a naqib (leader appointed over his people), and he also took part in the Battle of Badr.