Musnad Abu Ya'la al-Mawsili 109:102

'Abd al-Ghaffar narrated to us, 'Ali bin Mushir narrated to us, from Mujalid, from al-Sha'bi, from Jabir bin 'Abd Allah, who said: We were with the Prophet, may Allah bless him and grant him peace, when Sa'd bin Abi Waqqas approached. The Messenger of Allah, may Allah bless him and grant him peace, said: "This is my maternal uncle."