Exodus 25:17-21

And thou shalt make a mercy seat of pure gold: two cubits and a half shall be the length thereof, and a cubit and a half the breadth thereof.

And thou shalt make two cherubims of gold, of beaten work shalt thou make them, in the two ends of the mercy seat.

And make one cherub on the one end, and the other cherub on the other end: even of the mercy seat shall ye make the cherubims on the two ends thereof.

And the cherubims shall stretch forth their wings on high, covering the mercy seat with their wings, and their faces shall look one to another; toward the mercy seat shall the faces of the cherubims be.

And thou shalt put the mercy seat above upon the ark; and in the ark thou shalt put the testimony that I shall give thee.