en_tn/2ch/07/06.md

each standing where they serve

"each standing in their appointed place"

the Levites also with instruments of music of Yahweh

The word "stood" is understood from the previous phrase. AT: the Levites also stood with instruments of music of Yahweh" (See: rc://en/ta/man/translate/figs-ellipsis)

For his covenant faithfulness endures for ever

The abstract noun "faithfulness" can be stated as "faithfully" or "faithful." See how you translated "covenant faithfulness" in 2 Chronicles 7:3. AT: "God will always be faithful to his covenant with us" or "God will always faithfully love us" (See: rc://en/ta/man/translate/figs-abstractnouns)

all Israel

This generalization refers to those who were at the feast in Jerusalem, not necessarily to every person who lived in Israel. (See: rc://en/ta/man/translate/figs-hyperbole)