Exodus 26:4-6

Revised Standard Version Catholic Edition

⁴ And you shall make loops of blue on the edge of the outmost curtain in the first set; and likewise you shall make loops on the edge of the outmost curtain in the second set. ⁵ Fifty loops you shall make on the one curtain, and fifty loops you shall make on the edge of the curtain that is in the second set; the loops shall be opposite one another. ⁶ And you shall make fifty clasps of gold, and couple the curtains one to the other with the clasps, that the tabernacle may be one whole.