Jeremiah 33:19-21

And the word of the Lord came to Jeremiah, saying, The Lord has said: If it is possible for my agreement of the day and the night to be broken, so that day and night no longer come at their fixed times, Then my agreement with my servant David may be broken, so that he no longer has a son to take his place on the seat of the kingdom; and my agreement with the Levites, the priests, my servants.