Exodus 26:15

The overhanging part that remains of the curtains of the tent—the half curtain that remains—shall hang over the back of the tabernacle.

The cubit on the one side and the cubit on the other side, of that which remains 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.

You shall make a covering for the tent of rams’ skins dyed red, and a covering of sea cow hides above.

Ten cubits shall be the length of a board, and one and a half cubits the width of each board.

There shall be two tenons in each board, joined to one another: thus you shall make for all the boards of the tabernacle.

You shall make twenty boards for the tabernacle, for the south side southward.