Jeremiah 51:63-64

And it will be that, when you have come to an end of reading this book, you are to have a stone fixed to it, and have it dropped into the Euphrates: And you are to say, So Babylon will go down, never to be lifted up again, because of the evil which I will send on her: and weariness will overcome them. So far, these are the words of Jeremiah.