Exodus 36:19 YLT

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.

²⁰  And he maketh the boards for the tabernacle of shittim wood, standing up;

²¹  ten cubits 'is' the length of the 'one' board, and a cubit and a half the breadth of the 'one' board;