Solomon
Proverbs 6:18ESV·traditional attribution

a heart that devises wicked plans, feet that make haste to run to evil,

Matthew Henry Presbyterian @wholebiblehenry

Solomon here gives us, I. The characters of one that is mischievous to man and dangerous to be dealt with. If the slothful are to be condemned, that do nothing, much more those that do ill, and contrive to do all the ill they can. It is a naughty person that is here spoken of, Heb.

Commenting on Proverbs 6:12-19

John Gill Reformed Baptist @doctorgill

A false witness that speaketh lies,.... Or, "that speaketh lies, even a false witness" (f); and so this is distinguished from a lying tongue, the second of these evils: this is the sin of bearing false witness against one's neighbour, a breach of the eighth command.

Geneva Bible Notes Reformed @genevanotes

An heart that deviseth wicked imaginations, feet that be swift in running to mischief, (h) Meaning, the raging affections, which carry a man away in such sort that he cannot tell what he does.