One day, Hazrat ‘Ali (radhiyallahu ‘anhu) was standing beside Rasulullah (sallallahu ‘alaihi wasallam) on the right side performing salaah with him. Coincidentally, Abu Taalib passed by with Hazrat Ja’far (radhiyallahu ‘anhu). When Abu Taalib saw Hazrat ‘Ali (radhiyallahu ‘anhu) performing salaah with Rasulullah (sallallahu ‘alaihi wasallam), he addressed Hazrat Ja’far (radhiyallahu ‘anhu) saying, “O son! You should also support your cousin like Hazrat ‘Ali (radhiyallahu ‘anhu). Stand on the left of Rasulullah (sallallahu ‘alaihi wasallam) and join them in salaah.”

Hazrat Ja’far (radhiyallahu ‘anhu) was also one of the first Sahaabah (radhiyallahu ‘anhum) to embrace Islam. He was either the twenty first or twenty fifth person to embrace Islam.

(Extracted from Seeratul Mustafa 1/160-161)