Exodus 36:17 in the King James Version
And he made fifty loops upon the uttermost edge of the curtain in the coupling, and fifty loops made he upon the edge of the curtain which coupleth the second.
Context
16 He coupled five curtains by themselves, and six curtains by themselves.
17 He made fifty loops on the edge of the curtain that was outermost in the coupling, and he made fifty loops on the edge of the curtain which was outermost in the second coupling.
18 He made fifty clasps of bronze to couple the tent together, that it might be a unit.