Numbers 15:38-39

³⁸“Speak to the children of Israel, and tell them that they should make themselves fringes on the borders of their garments throughout their generations, and that they put on the fringe of each border a cord of blue.

³⁹It shall be to you for a fringe, that you may see it, and remember all the LORD’s commandments, and do them; and that you don’t follow your own heart and your own eyes, after which you used to play the prostitute;