Zakariyya Ibn Adam narrates:
One day, I was in the presence of Imam Ali Reza (a.s.) when his son, Imam Muhammad al-Jawad (a.s.), who was less than four years old, was brought to him. As he came in, he (a.s.) struck his palms on the ground, raised his head towards the heavens and remained engrossed in deep thought for a long time.
Seeing this, Imam Reza (a.s.) (asked him) –May I be your ransom! What are you thinking about?
Imam Jawad (a.s.) replied: I am engrossed in thought regarding the sufferings that befell my mother, Fatima (s.a.). By Allah! I will bring out those two men (Shaikhain) from their graves and burn them and then scatter their ashes into the seas.
Hearing this, Imam Reza (a.s.) asked his son to be brought closer to him, kissed him (a.s.) on his forehead and remarked, ‘May my parents be your ransom! You are worthy for this affair (Imamat).’
Mustadrak Wasaail al-Shia vol. 1 p.123
Dalaail al-Imaamah p. 212
Ithbaat al-Wasiyyah p. 218
Madinah al-Ma’ajiz, vol. 7 p. 325
Behaar al-Anwaar vol. 50 p. 59