כִּ֤י מְשׁוּבַ֣ת פְּתָיִ֣ם תַּֽהַרְגֵ֑ם וְשַׁלְוַ֖ת כְּסִילִ֣ים תְּאַבְּדֵֽם׃
For the waywardness of the thoughtless shall slay them, and the confidence of fools shall destroy them.
Rashi on Proverbs
for the backsliding of the naive Heb. משובת פתים. Insofar as their heart backslides.
Rashi on Proverbs
and the tranquility of the fools shall cause them to perish Since they see the wicked who prosper, they adhere to their evil and do not repent.