Exodus 36:17-19

Young's Literal Translation

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;

¹⁹ and he maketh a covering for the tent of rams' skins made red, and a covering of badgers' skins above.