'Planks' in the Bible

You are to make the altar hollow with planks; as you were shown on the mountain [of Sinai], so shall it be made.

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

“They have made all your planks of fir trees from Senir;They have taken a cedar from Lebanon to make a mast for you.