en_tn_condensed/num/08/19.md

I have given the Levites as a gift to Aaron and his sons

Yahweh appointing the Levites to help Aaron and his sons is spoken of as if they were a gift that Yahweh were giving to Aaron and his sons.

I have taken them ... I have given them

Here "them" refers to the Levites.

when they come near

Here "they" refers to the people of Israel.