Matthew Poole and continuators on Exodus 26:4

4 And thou shalt make loops of blue upon the edge of the one curtain, from the selvedge in the coupling : and likewise shalt thou make in the uttermost edge of another curtain, in the coupling of the second.

Which together with the taches were for the joyning the curtains together, as appears from verse 11. which way of conjunction was most convenient for the often taking them down and setting them up.

Or from or in the extremity, or end, or edge. Heb. lip.

(i. e.) In the place where the two curtains are coupled together.

The second curtain is to be made exactly like the first.