Commentary for Proverbs 17:18
אָדָ֣ם חֲסַר־לֵ֭ב תּוֹקֵ֣עַ כָּ֑ף עֹרֵ֥ב עֲ֝רֻבָּ֗ה לִפְנֵ֥י רֵעֵֽהוּ׃
A man void of understanding is he that striketh hands, And becometh surety in the presence of his neighbour.
Rashi on Proverbs
A person without sense clasps hands [This refers to] surety of money. Another explanation: He clasps with the wicked to go in their ways, while he is already a guarantor for his friend. He already accepted surety for the Holy One, blessed be He, to keep His commandments.
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