King James Version (KJV)
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:
Modern English
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.
Hebrew
וְהָיָה֙ כְּכַלֹּ֣תְךָ֔ לִקְרֹ֖א אֶת־הַסֵּ֣פֶר הַזֶּ֑ה תִּקְשֹׁ֤ר עָלָיו֙ אֶ֔בֶן וְהִשְׁלַכְתּ֖וֹ אֶל־תּ֥וֹךְ פְּרָֽת׃
vhayah kkalotka liqroʾ ʾet-haseper hazeh tiqshor ʿalayv ʾeben vhishlaktvo ʾel-tvok prat