Proverbs 23:7
“For as he thinketh in his heart, so is he: Eat and drink, saith he to thee; but his heart is not with thee.”
Wilt thou set thine eyes upon that which is not? for riches certainly make themselves wings; they fly away as an eagle toward heaven.
Eat thou not the bread of him that hath an evil eye, neither desire thou his dainty meats:
For as he thinketh in his heart, so is he: Eat and drink, saith he to thee; but his heart is not with thee.
The morsel which thou hast eaten shalt thou vomit up, and lose thy sweet words.
Speak not in the ears of a fool: for he will despise the wisdom of thy words.
Counter-Arguments
The strongest case that this verse does not belong in this theme.

Cross-References
“They speak vanity every one with his neighbour: with flattering lips and with a double heart do they speak.”
“The words of his mouth were smoother than butter, but war was in his heart: his words were softer than oil, yet were they drawn swords.”
“And she said unto him, How canst thou say, I love thee, when thine heart is not with me? thou hast mocked me these three times, and hast not told me wherein thy great strength lieth.”
“Now when the Pharisee which had bidden him saw it, he spake within himself, saying, This man, if he were a prophet, would have known who and what manner of woman this is that toucheth him: for she is a sinner.”
“And as he spake, a certain Pharisee besought him to dine with him: and he went in, and sat down to meat.”