Here is a benefit from a khutbah by Abu Uwais Abdullah Ali (rahimahullah Ta'ala) from a khutbah titled: The Forbiddance of Innovations & Newly Invented Matters, in which he (rahimahullah Ta'ala) breaksdown some of the affairs related to the issue of what a bid'ah (innovation) actually is.
In one of the benefits, he (rahimahullah Ta'ala) explains why an innovation is a going astray.
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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