I would guess that this audio is a khutbah that was delivered by Abu Uwais Abdullah Ali (rahimahullah Ta'ala) on this subject matter.
Without any further delay. Here is that lecture that I originally found on YouTube and digitally remastered in order to remove excessive background noise.
Indeed this is a timely reminder for us all, at this time of the year,
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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