Who has measured [the] waters in the hollow of his hand and marked off [the] heavens with span, comprehended the dust of the earth in third of a measure and weighed out [the] mountains in the scales, and [the] hills in a balance?
You will make it hollow with boards. As it was shown you on the mountain, so they will do.
And he put the poles into the rings on the sides of the altar to carry it with them. He made it hollow with boards.
1 Kings 7:15
He cast the two pillars [out of] bronze; eighteen cubits [was] the height of the first, and a cord of twelve cubits would encircle the second pillar.
Now the pillars, [the] height of one pillar [was] eighteen cubits, and a thread of twelve cubits surrounded it, and its thickness [was] four fingers, hollowed out.