This word is used here to draw someone's attention to what is said next. Alternate translation: "Listen" or "Pay attention to what I am about to tell you"
Here the throne that the king of Judah sits on is represented as "David's throne." Alternate translation: "the kings who sit on Judah's throne" or "the kings of the nation of Judah" (See: [[rc://en/ta/man/translate/figs-metonymy]])