Jeremiah 51:63
When you finish reading this scroll, tie a stone to it and cast it into the Euphrates.
Berean Standard Bible
And it shall be, when thou hast made an end of reading this book, that thou shalt bind a stone to it, and cast it into the midst of Euphrates:
It will be, when you have finished reading this book, that you shall bind a stone to it, and cast it into the middle of the Euphrates.