Proverbs 23:8 KJV

The morsel which thou hast eaten shalt thou vomit up, and lose thy sweet words.
Proverbs 23:8, King James Version

In 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.