Exodus 20:9

9For six days
The text has simply “six days,” but this is an adverbial accusative of time, answering how long they were to work (GKC 374 #118.k).
you may labor
The imperfect tense has traditionally been rendered as a commandment, “you will labor.” But the point of this commandment is the prohibition of work on the seventh day. The permission nuance of the imperfect works well here.
and do all your work,
This is the occupation, or business of the work week.
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