Exodus 26:3-5

Darby Translation

³ Five of the curtains shall be coupled one to another, and [the other] five curtains coupled one to another.

⁴ And thou shalt make loops of blue on the edge of the one curtain at the end of the coupling; and likewise shalt thou make [them] in the edge of the outermost curtain in the other coupling.

⁵ Fifty loops shalt thou make in the one curtain, and fifty loops shalt thou make at the end of the curtain in the other coupling: the loops shall be opposite to one another.