Exodus 36:17

And he made fifty loops on the edge of the curtain that is outermost in one set, and fifty loops he made on the edge of the curtain of the second set.

Surrounding context

36:16 He coupled five curtains by themselves and six curtains by themselves.

36:17 And he made fifty loops on the edge of the curtain that is outermost in one set, and fifty loops he made on the edge of the curtain of the second set.

36:18 He also made fifty bronze clasps to couple the tent together, that it might be one.

Translation and sources