Exodus 26:4-6

Young's Literal Translation

⁴ `And thou hast made loops of blue upon the edge of the one curtain, at the end in the joining; and so thou makest in the edge of the outermost curtain, in the joining of the second.

⁵ fifty loops thou dost make in the one curtain, and fifty loops thou dost make in the edge of the curtain which [is] in the joining of the second, causing the loops to take hold one unto another;

⁶ and thou hast made fifty hooks of gold, and hast joined the curtains one to another by the hooks, and the tabernacle hath been one.