Leviticus 22:31

31 “You must be sure to do my commandments.
Heb “And you shall keep my commandments and you shall do them.” This appears to be a kind of verbal hendiadys, where the first verb is a modifier of the action of the second verb (see GKC 386 #120.d, although שָׁמַר [shamar, “to keep”] is not cited there; cf. Lev 20:8, etc.).
I am the Lord.
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