Exodus 38:7

one cherub on the one end of the propitiatory, and another cherub on the other end of the propitiatory,

And he put the staves into the rings on the sides of the altar, to bear it withal; he made the altar hollow with boards.

He put the poles into the rings on the sides of the altar, with which to carry it. He made it hollow with planks.

The which barres he put into the rings on the sides of the altar to beare it withall, and made it hollow within the boardes.