Exodus 26:16

And thou shalt make a covering for the tent of rams’ skins dyed red, and a covering above of badgers’ skins.

And thou shalt make boards for the tabernacle of shittim wood standing up.

Two tenons shall there be in one board, set in order one against another: thus shalt thou make for all the boards of the tabernacle.

And thou shalt make the boards for the tabernacle, twenty boards on the south side southward.