4 You shall make loops of blue on the edge of the one curtain from the edge in the coupling; and likewise you shall make in the edge of the curtain that is outmost in the second coupling.
*Minor differences ignored. Grouped by changes, with first version listed as example.
The meaning appears to be, "And thou shalt make loops of blue on the edge of the one breadth (which is) on the side (of the one curtain) at the coupling; and the same shalt thou do in the edge of the outside breadth of the other (curtain) at the coupling." The "coupling" is the uniting together of the two curtains: ("selvedge" is the translation of a word signifying extremity or end).
And thou shalt make loops of blue upon the edge of the one curtain from the selvedge (b) in the coupling; and likewise shalt thou make in the uttermost edge of [another] curtain, in the coupling of the second.
(b) On the side that the curtains might be tied together.
And thou shall make loops of blue upon the edge of the one curtain,.... The first large curtain, consisting of five sewed together, at the edge of that:
from the selvedge in the coupling; where it was to be coupled with the other great curtain; "loops" or "eyelet holes" (h), were to be made: these were not wove with the curtains, for they were not to be upon all of them, only at the two outermost of the largest ones, and therefore were made afterwards, probably with the needle:
and likewise shall thou make in the uppermost edge of another curtain, in the coupling of the second; loops also were to be made on the outermost edge of another curtain belonging to the second great curtain, where it was to be coupled with the first.
(h) "ocellos", Vatablus.
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.
*More commentary available at chapter level.