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התשמר מצותו. שֶׁלֹּא תְנַסֵּהוּ וְלֹא תְהַרְהֵר אַחֲרָיו: התשמר מצותו [THAT HE MIGHT KNOW WHAT WAS IN THY HEART] WHETHER THOU WOULDST KEEP HIS COMMANDMENTS — viz., the commandment that ye should not put Him to the test, and that you should not doubt Him (i.e. His ways).