John Gills Exposition of the Bible Commentary - Proverbs 26:23
Burning lips, and a wicked heart ,.... Either burning with wrath and malice; breathing out threatenings and slaughter; pursuing men with reproaches and slanders, arising from a wicked heart: or rather, burning with profession of love to God, and affection to good men; with great pretensions of kindness, and promises of good things, when their hearts are wicked, and they design noticing less; say one thing with their lips, with the greatest show of affection and sincerity, and mean another in... read more
Matthew Henry's Complete Commentary - Proverbs 26:23
This may be meant either, 1. Of a wicked heart showing itself in burning lips, furious, passionate, outrageous words, burning in malice, and persecuting those to whom, or of whom, they are spoken; ill words and ill-will agree as well together as a potsherd and the dross of silver, which, now that the pot is broken and the dross separated from the silver, are fit to be thrown together to the dunghill. 2. Or of a wicked heart disguising itself with burning lips, burning with the professions of... read more