Proverbs 23:2 - Matthew Poole's English Annotations on the Holy Bible

Put a knife to thy throat; restrain and moderate thine appetite, as if a knife or some other thing stuck in thy throat, and hindered thee from swallowing what thou didst desire; or as if a man stood with a knife at thy throat ready to kill thee, if thou didst transgress; or though it be as irksome to thee to do so as if thou hadst a knife put to thy throat. So this is to be understood metaphorically, as that phrase of cutting off the right hand, & c., Matthew 5:29,30. Or, For thou dost (or, lest thou shouldst, as the Syriac interpreter renders it; or, otherwise thou wilt or shouldst) put a knife to thy throat. So the sense is, When thou goest to their feasts, thou dost expose thyself to great and manifest hazards, to thy own intemperance, and to all its dangerous consequences, and to the ill effects of other men's intemperance. Given to appetite; prone to excess in eating and drinking.