Be careful with ease as much as with severity.
See: "Be as careful in a light commandment as in a severe one."
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Translation
Expression (Hebrew)
הִקְפִּיד עַל קַלָּה כְּבַחֲמוֹרָהּ
Definition (Hebrew)
רְאֵה: "זָהִיר בְּמִצְוָה קַלָּה כְּבַחֲמוּרָה".
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