C. F. Keil and Franz Delitzsch on Exodus 26:4-5

Exo 26:4-5

They were also to make 50 hyacinth loops “on the border of the one piece of tapestry, from the end in the join,” i.e., on the extreme edge of the five pieces that were sewed together; and the same “on the border of the last piece in the second joined tapestry.” Thus there were to be fifty loops in each of the two large pieces, and these loops were to be מקבּילת “taking up the loops one the other;” that is to say, they were to be so made that the loops in the two pieces should exactly meet.