Matthew Henry on Proverbs 26:18-19
See here, 1. How mischievous those are that make no scruple of deceiving their neighbours; they are as madmen that cast firebrands, arrows, and death, so much hurt may they do by their deceits. They value themselves upon it as polite cunning men, but really they are as madmen. There is not a greater madness in the world than a wilful sin. It is not only the passionate furious man, but the malicious deceitful man, that is a madman; he does in effect cast fire-brands, arrows, and death; he does more mischief than he can imagine. Fraud and falsehood burn like fire-brands, kill, even at a distance, like arrows. 2. See how frivolous the excuse is which men commonly make for the mischief they do,…
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Such are reckless of results.
John Gill on Proverbs 26:19
So is the man that deceiveth his neighbour,.... By telling him a lie; or by reporting false things concerning him; or by cheating him in trade and commerce; or by taking his goods privately from him; and, when caught in either of these,
and saith, Am not I in sport? do not be angry, I designed no hurt; it is all in jest, a mere joke: but, had he not been apprehended, it would have been in earnest, as he was. This is only an excuse, and as absurd an one as if a man should set fire to his neighbour's house and barns, or throw arrows at him, or strike him with any instrument of death, as the sword, &c. and then say he was only in jest, or pretend madness.
Keil & Delitzsch on Proverbs 26:18-19
These verses form a tetrastich:
18 As a man who casteth brands,
And arrows, and death;
19 So is the man who deceiveth his neighbour,
And saith: I only make sport.
The old translations of מתלהלה are very diverse. Aquila has rendered it by κακοηθιζόμενος; Symmachus: πειρώμενοι; the Syr.: the vainglorious; the Targ.: מתּחת (from נחת), a successor (spiritually); Jerome: noxius (injurious; for which Luther: secret). There is thus no traditional translation. Kimchi explains the word by השׁתגע (Venet. ἐξεστώς); Aben Ezra by השׁתטה (from שׂטה), to behave thoughtlessly, foolishly; but both erroneously, confounding with it ותּלהּ, Gen 47:13, which is formed from להה and not from לההּ, and is relat…