Jeremiah 33:17-21 NIV

[17] For this is what the LORD says: ‘David will never fail to have a man to sit on the throne of Israel, [18] nor will the Levitical priests ever fail to have a man to stand before me continually to offer burnt offerings, to burn grain offerings and to present sacrifices.’ ” [19] The word of the LORD came to Jeremiah: [20] “This is what the LORD says: ‘If you can break my covenant with the day and my covenant with the night, so that day and night no longer come at their appointed time, [21] then my covenant with David my servant—and my covenant with the Levites who are priests ministering before me—can be broken and David will no longer have a descendant to reign on his throne.