2 Samuel 13:12 - Ellicott's Commentary On The Whole Bible

Do not thou this folly. — Tamar, now left alone in the power of her half-brother, endeavours to escape by reasoning. She first speaks of the sinfulness in Israel of that which was allowed among surrounding heathen, quoting the very words of Genesis 34:7, as if by the traditions of their nation to recall the king’s son to a sense of right. She then sets forth the personal consequences to themselves; if he had any love for her he could not wish that shame and contempt should meet her everywhere; and for himself, such an act would make him “as one of the fools in Israel,” as one who had cast off the fear of God and the restraints of decency.