John Gill Commentary Exodus 26:5

"Fifty loops shalt thou make in the one curtain, and fifty loops shalt thou make in the edge of the curtain that is in the second coupling; the loops shall be opposite one to another." — Exodus 26:5 (ASV)

Fifty loops you shall make in the one curtain; In the first great curtain, or in the outermost of the five that were sewed together.

And fifty loops you shall make in the edge of the curtain that is in the coupling of the second; As many also were to be made in the outermost of the second great curtain where it was to be coupled with the first.

That the loops may take hold one of another; Or rather that they might answer to one another in both curtains; for the loops could not take hold of one another, only were made to meet together by the taches, hooks, or clasps put into them, next mentioned.