Better, He who hideth hatred is of lying lips. He who cherishes hatred, is either a knave, or a fool - a knave if he hides, a fool if he utters it.

He that hideth - This is a common case. How many, when full of resentment, and deadly hatred, meditating revenge and cruelty, and sometimes even murder, have pretended that they thought nothing of the injury they had sustained; had passed by the insult, etc.! Thus lying lips covered the malevolence of a wicked heart.

He that hideth hatred with lying lips,.... Or he whose "lying lips hide hatred", which is much the same; who pretends to be a friend, and outwardly behaves as one, but inwardly nourishes and cherishes hatred in his heart, which he covers and conceals, till he has a proper opportunity of showing it; as Absalom to Ammon, Joab to Amasa, the men of Anathoth to Jeremiah, and Judas to Christ; see Proverbs 26:24. Or, "he that hideth hatred is a man of lying lips" (m); he is a liar, as the person next described is a fool. And he that uttereth slander is a fool; that brings it out by wholesale, and hides it not; who openly defames his neighbour, and in the most public manner; and with a multitude of words detracts from his good name, credit, and reputation, and loads him with calumny and reproach; such a man is a fool, a very wicked man: yea, not only the public slanderer, but the secret dissembler, who thinks himself a cunning man because he hides himself; each of these is a fool, the one as well as the other. Gersom thinks there is a comparison made between the dissembler and the slanderer; the one being a liar, and the other a fool; and that the former is more abominable and pernicious than the latter.
(m) "Esther vir laborium falsitatis", Piscator, "vel fallacium", Gejerus.

He is especially a fool who thinks to hide anything from God; and malice is no better.

Both vices must one day be known and punished, and hence their folly.

18 He that hideth hatred is a mouth of falsehood;
And he that spreadeth slander is a fool.
The lxx, καλύπτουσιν ἔχθραν χεῖλα δίκαια, which Ewald prefers, and which has given occasion to Hitzig to make a remarkable conjecture ("He who conceals hatred, close lips," which no one understands without Hitzig's comment. to this his conjecture). But (1) to hide hatred (cf. Proverbs 10:11, Proverbs 26:24) is something altogether different from to cover sin (Proverbs 10:12, Proverbs 17:9), or generally to keep anything secret with discretion (Proverbs 10:13); and (2) that δίκαια is a corrupt reading for ἄδικα (as Grabe supposes, and Symmachus translates) or δόλια (as Lagarde supposes, and indeed is found in Codd.). Michaelis well remarks: odium tectum est dolosi, manifesta sycophantia stultorum. Whoever conceals hateful feelings behind his words is שׂפתי־שׂקר, a mouth of falsehood (cf. the mouth of the fool, Proverbs 10:14); one does not need to supply אישׁ, but much rather has hence to conclude that a false man is simply so named, as is proved by Psalm 120:3. There is a second moral judgment, 18b: he who spreadeth slander (וּמוצא, according to the Masoretic writing: he who divulges it, the correlate to הביא, to bring to, Genesis 37:2) is a Thor fool, stupid, dull, כּסיל (not a Narr fool, godless person, אויל); for such slandering can generally bring no advantage; it injures the reputation of him to whom the דבּה, i.e., the secret report, the slander, refers; it sows discord, has incalculable consequences, and finally brings guilt on the tale-bearer himself.

Lying lips - With flattering words. He here condemns two opposite vices, secret hatred, and manifest slander.