When Ali Bin Jailer Sadiq (A.S.) acknowledged Imam Taqi (A.S.) as the next Imam, Imam Reza (A.S.) was very happy and reminded him that Imam Musa Kazim (A.S.) used to say that the Prophet (SAW W) once told Imam Ali (A.S.) that the son of the best of the Nubian maid-servant would be among his descendants.
Kama vile Uchamungu wa Imamu Musa Kazim [a] ulivyoathiri walinzi wa jela alimofungiwa, Zarraqi nae pia katika muda mfupi sana alielewa kuwa mfungwa wake alikuwa mtu apasikaye kuheshimiwa badala ya kumfedhehesha na hivyo alibadilisha tabia yake kwa Imamu [a].