Exodus 36:15-17

Young's Literal Translation

¹⁵ the length of the one curtain [is] thirty by the cubit, and the breadth of the one curtain [is] four cubits; one measure [is] to the eleven curtains;

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;