Exodus 26:15

12 And the overhanging part that remaineth of the curtains of the tent, the half curtain that remaineth, shall hang over the back of the tabernacle.

13 And the cubit on the one side, and the cubit on the other side, of that which remaineth in the length of the curtains of the tent, shall hang over the sides of the tabernacle on this side and on that side, to cover it.

14 And thou shalt make a covering for the tent of rams` skins dyed red, and a covering of sealskins above.

15 And thou shalt make the boards for the tabernacle of acacia wood, standing up.

16 Ten cubits shall be the length of a board, and a cubit and a half the breadth of each board.

17 Two tenons shall there be in each board, joined one to another: thus shalt thou make for all the boards of the tabernacle.

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