Jeremiah 33:20-21

20‘I, the Lord, say to you, “The day and the night will always come at their proper times. I have made that agreement with them, and nobody can stop it.

21In the same way, nobody can stop the covenant that I have made with my servant David, and with the Levites. I promise you that there will always be a descendant of King David who rules as king. I also promise that there will always be descendants of Levi to serve me as priests.