Here is, 1. A repetition of what was said before (Pro 19:5), for we have need to be again and again warned of the danger of the sin of lying and false-witness-bearing, since nothing is of more fatal consequence. 2. An addition to it in one word; there it was said, He that speaks lies shall not escape, and intimated that he shall be punished. Here it is said, His punishment shall be such as will be his destruction: he shall perish; the lies he forged against others will be his own ruin. It is a damning destroying sin.

A false witness shall not be unpunished,.... See Gill on Pro 19:5;

and he that speaketh lies shall perish; or "be lost", shall be undone for ever; he shall not enter into the holy city, but have his part in the lake of fire: they that speak lies in hypocrisy, doctrinal ones, and are given up to believe and profess them, such shall be damned, Th2 2:11.

(Compare Margin; Pro 15:32).

loveth . . . soul--or, "himself," which he evinces by regarding his best interests.

keepeth--or, "regards."