Though he spare it - That is, though he retains it long in his mouth, that he may enjoy it the more.

And forsake it not - Retains it as long as he can.

But keep it still within his mouth - Margin, as in Hebrew "in the midst of his palate." He seeks to enjoy it as long as possible.

Though he spare it,.... Not that he feeds sparingly on it, for he eats of it freely and plentifully, with great eagerness and greediness; it designs the gratefulness of it to him; he does not spit it out as loathsome, having tasted of it, but retains it as sweet and pleasant; he spares it as Saul did Agag, and as a man spares his only son; sin being a child, a brat of a wicked man, and therefore it is dear unto him:

and forsake it not: as he never will, until he is fully convinced of the evil of it, and it becomes exceeding sinful to him, and so loathsome and disagreeable; and he is restrained from it by the grace of God, and enabled by it to desert it, for such an one only finds mercy, Proverbs 28:13;

but keep it still within his mouth; like an epicure, that will not suffer his food quickly to go down his throat into his stomach, that he may have the greater pleasure in tasting, palating, and relishing it; as Philoxenus, who wished his throat as long as a crane's, that he might be the longer in tasting the sweetness of what he ate and drank; so the wicked man keeps sin within his mouth, not by restraining his mouth from speaking evil, rather by a non-confession of it, but chiefly by continuing and persisting in it, that he might have all the pleasure and satisfaction he has promised himself in it.

Though he spare it, and forsake it not; but keep it still within his mouth:

within...: Heb. in the midst of his palate

20:10-22 The miserable condition of the wicked man in this world is fully set forth. The lusts of the flesh are here called the sins of his youth. His hiding it and keeping it under his tongue, denotes concealment of his beloved lust, and delight therein. But He who knows what is in the heart, knows what is under the tongue, and will discover it. The love of the world, and of the wealth of it, also is wickedness, and man sets his heart upon these. Also violence and injustice, these sins bring God's judgments upon nations and families. Observe the punishment of the wicked man for these things. Sin is turned into gall, than which nothing is more bitter; it will prove to him poison; so will all unlawful gains be. In his fulness he shall be in straits, through the anxieties of his own mind. To be led by the sanctifying grace of God to restore what was unjustly gotten, as Zaccheus was, is a great mercy. But to be forced to restore by the horrors of a despairing conscience, as Judas was, has no benefit and comfort attending it.