en_tn/deu/18/05.md

has chosen him

Here "him" represents all the Levites. (See: rc://en/ta/man/translate/figs-metonymy)

to stand to serve in the name of Yahweh

Here "the name of Yahweh" stands for Yahweh himself and his authority. AT: "to be his special servants" or "to serve as a representative of Yahweh" (See: rc://en/ta/man/translate/figs-metonymy)

him and his sons forever

Here "him" represents all the Levites. AT: "the Levites and their descendants forever" (See: rc://en/ta/man/translate/figs-synecdoche)