Musnad Ahmad 33:840

Muhammad ibn Ja‘far narrated to us, Shu‘bah narrated to us, from ‘Amr ibn Dinar, from Jabir ibn ‘Abdullah, who said: "We used to do it during the time of the Messenger of Allah, may Allah bless him and grant him peace," meaning *al-‘azl* (coitus interruptus). I said to ‘Amr: "Did you hear it from Jabir?" He said: "No."