Exodus 26:4-6

26:4 You are to make loops of blue material along the edge of the end curtain in one set, and in the same way you are to make loops in the outer edge of the end curtain in the second set. 26:5 You are to make fifty loops on the one curtain, and you are to make fifty loops on the end curtain which is on the second set, so that the loops are opposite one to another. 26:6 You are to make fifty gold clasps and join the curtains together with the clasps, so that the tabernacle is a unit.