Proverbs 23:8 in the World English Bible
You will vomit up the morsel which you have eaten and waste your pleasant words.
Context
7 For as he thinketh in his heart, so is he: Eat and drink, saith he to thee; but his heart is not with thee.
8 The morsel which thou hast eaten shalt thou vomit up, and lose thy sweet words.
9 Speak not in the ears of a fool: for he will despise the wisdom of thy words.