Exodus 26:1, 9, 12

“Moreover, you shall make the tabernacle (sacred tent of worship) with ten [interior] curtains of fine twisted linen, and blue, purple, and scarlet fabric; you shall make them with [embroidered] cherubim, the handwork of a skillful craftsman.

You shall join five curtains by themselves and the other six curtains by themselves, and you shall double over the sixth curtain at the front of the tent [to make a closed door].

The overlapping part that is left over from the tent curtains, the half curtain that is left over, shall lap over the back of the tabernacle.