Matthew Poole and continuators on Proverbs 12:17

17. He that speaketh truth , sheweth forth righteousness , but a false witness deceit .

Heb. He that will speak truth, i. e. he who accustometh himself to speak truth in common conversation; for the future Tense in the Hebrew Tongue oft notes a continued act or habit.

To wit, as a witness in publick judgment, he will speak nothing but what is true and just; you may depend upon his Testimony.

He who useth himself to lying in his common talk, will use falseshood and deceit in judgment.

Marginal references: Ch. 13. 5. & 14. 5.