Numbers 15:38

“Speak unto the children of Israel, etc.] Whom it only concerned, and all of them, except women and children; for priests, Levites, Israelites, proselytes, and freed servants, were bound to wear the fringes, but not Gentiles; nor might the Gentiles make them, what were made by them were not to be used f211, since it follows: and bid them that they make them fringes in the borders of their garments, throughout their generations: the garments on which these fringes were put were such that were made either of linen or of woollen; no other were obliged to them by the law; but according to the Rabbins other garments were also, yet only square garments, which they call the Talith; and if that had…”

“bid them that they make them fringes in the borders of their garments--These were narrow strips, in a wing-like form, wrapped over the shoulders and on various parts of the attire. "Fringe," however, is the English rendering of two distinct Hebrew words--the one meaning a narrow lappet or edging, called the "hem" or "border" (Mat 23:5; Luk 8:44), which, in order to make it more attractive to the eye and consequently more serviceable to the purpose described, was covered with a riband of blue or rather purple color; the other term signifies strings with tassels at the end, fastened to the corners of the garment. Both of these are seen on the Egyptian and Assyrian frocks; and as the Jewish…”

“That they put upon the fringe of the borders a ribband of blue - Reader that they add to the fringes of the borders (or corners) a thread of blue (compare the marginal references). These fringes are considered to be of Egypttian origin. The ordinary outer Jewish garment was a quadrangular piece of cloth like a modern plaid, to the corners of which, in conformity with this command, a tassel was attached. Each tassel had a conspicuous thread of deep blue, this color being doubtless symbolic of the heavenly origin of the commandments of which it was to serve as a memento. Tradition determined that the other threads should be white - this color being an emblem of purity (compare Isaiah 1:18).…”

“Fringes - These were certain threads or ends, standing out a little further than the rest of their garments, lest there for this use. In the borders - That is, in the four borders or quarters, as it is, Deu 22:12. Of their garments - Of their upper garments. This was practiced by the Pharisees in Christ's time, who are noted for making their borders larger than ordinary. A ribband - To make it more obvious to the sight, and consequently more serviceable to the use here mentioned. Of blue - Or, purple. Numbers 15:39”

“fringes in the borders: The word tzitzith properly denotes an ornament resembling a flower. From Num 15:39, we learn that these were emblematical of the commands of God. That there is any analogy between a fringe and a precept, it would be bold to assert; but when a thing is appointed to represent another, no matter how different, that first object becomes the legitimate representative or sign of the other. Deu 22:12; Mat 9:20, Mat 23:5; Luk 8:44 Numbers 15:39”