Musnad Abu Ya'la al-Mawsili 240:3

Muhammad ibn Abdullah ibn Numayr narrated to us, Yunus ibn Bukayr narrated to us, Yunus ibn Abi Ishaq narrated to us, from his father, from al-Bara’ ibn Azib, that Zayd ibn Harithah said: "O Messenger of Allah, you have established brotherhood between me and Hamzah."