Proverbs 23:9 in the King James Version
Speak not in the ears of a fool: for he will despise the wisdom of thy words.
Context
8 You will vomit up the morsel which you have eaten and waste your pleasant words.
9 Don’t speak in the ears of a fool, for he will despise the wisdom of your words.
10 Don’t move the ancient boundary stone. Don’t encroach on the fields of the fatherless,