Exodus 36:16-18

Young's Literal Translation

¹⁶ and he joineth the five curtains apart, and the six curtains apart.

¹⁷ And he maketh fifty loops on the outer edge of the curtain, in the joining; and fifty loops he hath made on the edge of the curtain which is joining the second;

¹⁸ and he maketh fifty hooks of brass to join the tent -- to be one;