21 The verb וְנָתַתָּה (vénatattah) is normally “give.” Here, though, the context refers to the assignment of the Levites to the priests for their duties. The form is the perfect tense with vav (ו) consecutive, continuing the sequence for the imperfect of instruction.
22 This emphasis is derived from the simple repetition of the passive participle, נְתוּנִם נְתוּנִם (nétunim nétunim). See §123.e. The forms serve as the predicate with the subject pronoun.
23 The Hebrew text simply has the preposition, “from the Israelites.”

In other versions

And you shall give the Levites to Aaron and his sons; they are wholly given to him from among the people of Israel.

Give the Levites to Aaron and his sons; they are the Israelites who are to be given wholly to him.

Assign the Levites to Aaron and his sons; they have been assigned exclusively to him from the Israelites.

Assign the Levites to Aaron and his sons. They have been given from among all the people of Israel to serve as their assistants.

You will give the Levites to Aaron and to his descendants; they are surely assigned to him from among the Israelites.

And thou shalt give the Levites unto Aaron and to his sons: they are wholly given unto him out of the children of Israel.

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