Exodus 26:1, 9, 12

“Moreover you shall make the tabernacle with ten curtains of fine woven linen and blue, purple, and scarlet thread; with artistic designs of cherubim you shall weave them.

And you shall couple five curtains by themselves and six curtains by themselves, and you shall double over the sixth curtain at the forefront of the tent.

The remnant that remains of the curtains of the tent, the half curtain that remains, shall hang over the back of the tabernacle.