 In 1959 he was appointed the Islamic scholar () for Lindi, Tanzania.In 1962, he conceived a plan for propagating Islam.. His plan was proposed and approved at the triennial Conference of the Supreme Council of Africa Federation of K.S.I Jamaats of Africa in Tanga in 1964. and became the Bilal Muslim Mission.Rizvi was transferred from Arusha to Dar es Salaam in mid-eastern Tanzania and Bilal Muslim Mission of Tanzania was officially registered in 1968.