John Gill Commentary Proverbs 23:7

"For as he thinketh within himself, so is he: Eat and drink, saith he to thee; But his heart is not with thee." — Proverbs 23:7 (ASV)

For as he thinks in his heart, so [is] he He is not the man his mouth speaks or declares him to be, but what his heart thinks; which is discovered by his looks and actions, and by which he is to be judged of, and not by his words;

eat and drink, says he to you, but his heart [is] not with you; he bids you eat and drink, but he does not desire you should, at least but very sparingly; it is only a mere compliment, not a hearty welcome.