Exodus 26:4-6

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