Exodus 26:16KJV

14And thou shalt make a covering for the tent rams' skins dyed red, and a covering above badgers' skins.

15And thou shalt make boards for the tabernacle shittim wood standing up.

16Ten cubits the length of a board, and a cubit and a half the breadth of one board.

17Two tenons in one board, set in order one against another: thus shalt thou make for all the boards of the tabernacle.

18And thou shalt make the boards for the tabernacle, twenty boards on the south side southward.