The getting of treasures by a lying tongue is a vanity tossed to and fro of them that seek death.

Wesley's Notes

21:6 Lying tongue - By any false or deceitful words or actions. Is tossed - Is like the chaff or smoak driven away by the wind. Of them - That take those courses which will bring destruction upon them.

Jamieson-Fausset-Brown Bible Commentary

6. The getting-or, "what is obtained" (compare Job 7:2; Jer 22:13, Hebrew).

vanity . to and fro-as fleeting as chaff or stubble in the wind (compare Pr 20:17-21; Ps 62:10). Such gettings are unsatisfactory.

them . death-act as if they did (Pr 8:36; 17:19).

Matthew Henry's Concise Commentary

21:1 The believer, perceiving that the Lord rules every heart as he sees fit, like the husbandman who turns the water through his grounds as he pleases, seeks to have his own heart, and the hearts of others, directed in his faith, fear, and love. 2. We are partial in judging ourselves and our actions. 3. Many deceive themselves with a conceit that outward devotions will excuse unrighteousness. 4. Sin is the pride, the ambition, the glory, the joy, and the business of wicked men. 5. The really diligent employ foresight as well as labour. 6. While men seek wealth by unlawful practices, they seek death. 7. Injustice will return upon the sinner, and will destroy him here and for ever. 8. The way of mankind by nature is froward and strange.

Matthew Henry's Whole Bible Commentary

Verse 6

This shows the folly of those that hope to enrich themselves by dishonest practices, by oppressing and over-reaching those with whom they deal, by false-witness-bearing, or by fraudulent contracts, of those that make no scruples of lying when there is any thing to be got by it. They may perhaps heap up treasures by these means, that which they make their treasure; but, 1. They will not meet with the satisfaction they expect. It is a vanity tossed to and fro; it will be disappointment and vexation of spirit to them; they will not have the comfort of it, nor can they put any confidence in it, but will be perpetually uneasy. It will be tossed to and fro by their own consciences, and by the censures of men; let them expect to be in a constant hurry. 2. They will meet with destruction they do not expect. While they are seeking wealth by such unlawful practices they are really seeking death; they lay themselves open to the envy and ill-will of men by the treasures they get, and to the wrath and curse of God, by the lying tongue wherewith they get them, which he will make to fall upon themselves and sink them to hell.