There is an excellent lecture that I have digitally remastered with the permission of Allah. On this very important matter that many, if not most people are ignorant about delivered by Shaykh Abu Muhammad Badee Uddin Shah as-Sindee ar-Rashidee (rahimahullah Ta'ala).
Abu Hurairah (رضي الله عنه) narrated that the Prophet ﷺ said: "Whoever invites to guidance will be rewarded like those who follow him in the guidance are rewarded, and that will not decrease the reward of those who have followed him." [Collected by Imām Muslim]
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