en_tn_lite_do_not_use/jer/30/09.md

they will worship Yahweh their God ... their king ... over them

Yahweh continues speaking about the descendants of Jacob. AT: "you will worship Yahweh your God ... your king ... over you" (See: rc://en/ta/man/translate/figs-123person)

David their king

This is a metonym for one of David's descendants. AT: "a man descended from their King David" (See: rc://en/ta/man/translate/figs-metonymy)