Exodus 26:1, 9, 12

“Make the tabernacle with ten curtains of finely twisted linen and blue, purple and scarlet yarn, with cherubim woven into them by a skilled worker.

Join five of the curtains together into one set and the other six into another set. Fold the sixth curtain double at the front of the tent.

As for the additional length of the tent curtains, the half curtain that is left over is to hang down at the rear of the tabernacle.