Exodus 29:35

35 “Thus you are to do for Aaron and for his sons, according to all that I have commanded you; you are to consecrate them
Heb “you will fill their hand.”
for
The “seven days” is the adverbial accusative explaining that the ritual of the filling should continue daily for a week. Leviticus makes it clear that they are not to leave the sanctuary.
seven days.
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