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.English Standard Version
And he put the poles through the rings on the sides of the altar to carry it with them. He made it 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.