What does Jeremiah 33:19 mean?

In those days Judah will be saved, and Jerusalem will dwell safely. This is the name by which she will be called: Yahweh our righteousness.”

For Yahweh says: “David will never lack a man to sit on the throne of the house of Israel.

The priests the Levites won’t lack a man before me to offer burnt offerings, to burn meal offerings, and to do sacrifice continually.”

“Yahweh says: ‘If you can break my covenant of the day and my covenant of the night, so that there will not be day and night in their time;

then may my covenant also be broken with David my servant, that he won’t have a son to reign on his throne; and with the Levites the priests, my ministers.

As the army of the sky can’t be counted, and the sand of the sea can’t be measured; so I will multiply the offspring of David my servant and the Levites who minister to me.’”