Exodus 26:4-6

4You shall make loops of 1blue on the edge of the 2outermost curtain in the first set, and likewise you shall make them on the edge of the curtain that is outermost in the second 3set. 5You shall make fifty loops in the one curtain, and you shall make fifty loops on the 4edge of the curtain that is in the second 5set; the loops shall be opposite each other. 6You shall make fifty clasps of gold, and 6join the curtains to one another with the clasps so that the 7tabernacle will be a unit.