After Imam Al-Kadhum’s martyrdom, Imamhood shifted into his son Ali bin Mosa Ar-Ridha “a.s.” who was in the thirty-fifth of his honoured age. In addition to his Divine Imamhood and guidance of the Islamic nation, he was the lonely legatee of his father Al-Kaadhum “a.s.” who will take up on himself the responsibility of his father’s sons, brother sand sisters.
Baada ya kufariki Imam Kaadhim (a.s) wadhifa wa kuuongoza umma ulichukuliwa na mwane Imam Ridha (a.s), ambaye umri wake ulikuwa ni miaka thelathini na mitano mbali na wadhifa wake aliopewa na Mwenyezi Mungu (s.w.t) wa kuongoza umma alikuwa ni mhusiwa wa pekee wa baba yake mpenzi katika kuwaangalia ndugu zake wa kike na kiume, na wadhifa wake aliutekeleza bila ya wasiwasi, ingawa utawala wa Haroun ulijaribu mumwekea vikwazo kwa njia ya siri kwani hali haikumruhusu kudhihirisha uadui wake.