King James Version
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.New International Version
They inserted the poles into the rings so they would be on the sides of the altar for carrying it. They made it hollow, out of boards.Catholic Public Domain Version
And he drew them through the rings, which projected from the sides of the altar. But the altar itself was not solid, but hollow, made from panels and empty inside