Exodus 26:9

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.

Surrounding context

26:8 The length of each curtain shall be thirty cubits, and the width of each curtain four cubits; and the eleven curtains shall all have the same measurements.

26:9 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.

26:10 You shall make fifty loops on the edge of the curtain that is outermost in one set, and fifty loops on the edge of the curtain of the second set.

Translation and sources