Exodus 36:11-12

And he made loops of blue on the edge of one curtain from the selvedge in the coupling: likewise he made in the uttermost side of {another} curtain, in the coupling of the second. {selvedge: an edge of cloth so woven that it cannot unravel} Fifty loops made he in one curtain, and fifty loops made he in the edge of the curtain which {was} in the coupling of the second: the loops held one {curtain} to another.