Jeremiah 33:18-22

And there will always be priests from the family of Levi. They will always stand before me to offer burnt offerings and grain offerings and sacrifices to me.” The LORD spoke his word to Jeremiah, saying: “This is what the LORD says: I have an agreement with day and night that they will always come at the right times. If you could change that agreement, only then could you change my agreement with David and Levi. Only then would my servant David not have a descendant ruling as king on David’s throne. And only then would the family of Levi not be priests serving me in the Temple. But I will give many descendants to my servant David and to the family group of Levi who serve me in the Temple. They will be as many as the stars in the sky that no one can count. They will be as many as the grains of sand on the seashore that no one can measure.”