Imam al-Jawad (a) is reported to have said, “The best worship is (that which is done with) sincerity.” Bihar al Anwar 67/249 He (a) became the Imam in his childhood. He was the youngest Imam when he was martyred. The 5th and 9th Holy Imam (a) shared the same name; Muhammad ibn Ali. They also had the same Kuniya; Abu Ja'far.