In it, he summarises the greatest calamity to ever fall mankind, the death of the Messenger of Allah (sallallaahu 'alaihi wa sallam)
The audio has been digitally edited to remove its background noise, walhamdulillah.
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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