Jeremiah 51:63

51:63 It shall be, when you have made an end of reading this book, that you shall bind a stone to it, and cast it into the midst of the Euphrates:
-World English Bible

Other Translation

51:63 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:
-King James Version