Matthew Henry and continuators on Proverbs 21:7

7 The robbery of the wicked shall destroy them; because they refuse to do judgment.

See here, 1. The nature of injustice. Getting money by lying (v. 6) is no better than downright robbery. Cheating is stealing; you might as well pick a man's pocket as impose upon him by a lie in making a bargain, which he had no fence against but by not believing you; and it will be no excuse from the guilt of robbery to say that he might choose whether he would believe you, for that is a debt we should owe to all men. 2. The cause of injustice. Men refuse to do judgment; they will not render to all their due, but withhold it, and omissions make way for commissions; they come at length to robbery itself. Those that refuse to do justice will choose to do wrong. 3. The effects of injustice; it will return upon the sinner's own head. The robbery of the wicked will terrify them (so some); their consciences will be filled with horror and amazement, will cut them, will saw them asunder (so others); it will destroy them here and for ever, therefore he had said (v. 6), They seek death.