Exodus 26:4-6

Darby Translation

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.

⁶ And thou shalt make fifty clasps of gold, and couple the curtains together with the clasps, that the tabernacle may be one [whole].