Exodus 38:7

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

Other versions

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.