Musannaf Ibn Abi Shayba 27:567

Narrated to us Abd al-Rahim, from Zakariya, from Amir, that Ja'far ibn Abi Talib was killed on the day of his death in al-Balqa'. The Messenger of Allah (may Allah bless him and grant him peace) said: "O Allah, succeed Ja'far in his family with the best of what You have succeeded any of Your righteous servants."