And thou shalt put the mercy-seat upon the ark of the testimony in the most holy place.

You are to put the cover on the ark of the law, inside the most holy place.

Και θελεις επιθεσει το ιλαστηριον επι της κιβωτου του μαρτυριου εν τω αγιω των αγιων.

And thou shalt put the mercy seat upon the ark of the testimony in the most holy place.