إِرْمِيَا 51:63

وَيَكُونُ إِذَا فَرَغْتَ مِنْ قِرَاءَةِ هَذَا ٱلسِّفْرِ أَنَّكَ تَرْبُطُ بِهِ حَجَرًا وَتَطْرَحُهُ إِلَى وَسْطِ ٱلْفُرَاتِ

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: