An assumption is not a truth

I have an assumption in one of my videos, and I’m glad it’s just a small thing, and not a big mistake, but still.
An assumption is the act of taking for granted, or supposing a thing without proof; supposition.

And now I thought, this is an opportunity to explain that this is not right. Because there are preachers who have made this their hobby in changing the word of God, some of them even do not believe the things they preach, wolves among the brethren.