Jeremiah 33:17-21

17For thus says the  Lord: a  David shall never lack a man to sit on the throne of the house of Israel, 18 b  and the Levitical priests shall never lack a man in my presence to offer burnt offerings, to burn grain offerings, and to make sacrifices forever.”

19The word of the  Lord came to Jeremiah: 20 c  Thus says the  Lord: d  If you can break my covenant with the day and my covenant with the night e  so that day and night will not come at their appointed time, 21 f  then also my covenant with David my servant may be broken, so that he shall not have a son to reign on his throne, and my covenant with the Levitical priests my ministers.
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