Then al-Ma'mun addressed the audience thus...

Then al-Ma'mun addressed the audience thus: "Did I not say that the Imam comes of a family which has been chosen by Allah as the repository of knowledge and learning? Is there any one in the world who can match even the children of this family? " All of them shouted, "Undoubtedly there is no one parallel to Muhammad ibn `Ali al-Jawad." In the same assembly al-Ma'mun wedded his daughter Ummu'l-Fadl to the Imam and liberally distributed charity and gifts among his subjects as a mark of rejoicing.