Numbers 8:15

15 “After this, the Levites will go in
The imperfect tense could also be given the nuance of the imperfect of permission: “the Levites may go in.”
to do the work
Heb “to serve.”
of the tent of meeting. So you must cleanse them
The two verbs in the rest of this verse are perfect tenses with vav (ו) consecutive constructions, making them equal to the imperfect. Some commentators try to get around the difficulty of repetition by making these future perfects, “and you will have cleansed,” as opposed to a summary statement, “for thus you will cleanse….”
and offer them like a wave offering.
The Greek text adds “before the Lord.”
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