Exodus 13:7

7Bread made without yeast must be eaten
The imperfect has the nuance of instruction or injunction again, but it could also be given an obligatory nuance.
for seven days;
The construction is an adverbial accusative of time, answering how long the routine should be followed (see GKC 374 #118.k).
no bread made with yeast shall be seen
Or “visible to you” (B. Jacob, Exodus, 366).
among you, and you must have no yeast among you within any of your borders.

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