Exodus 26:1, 9, 12

Moreover thou shalt make the tabernacle with ten curtains; of fine twined linen, and blue, and purple, and scarlet, with cherubim the work of the skilful workman shalt thou make them.

And thou shalt couple five curtains by themselves, and six curtains by themselves, and shalt double over the sixth curtain in the forefront of the tent.

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.