Numbers 15:38-40

Speak unto the children of Israel, and bid them that they make them fringes in the borders of their garments throughout their generations, and that they put upon the fringe of each border a cord of blue: and it shall be unto you for a fringe, that ye may look upon it, and remember all the commandments of Jehovah, and do them; and that ye follow not after your own heart and your own eyes, after which ye use to play the harlot; that ye may remember and do all my commandments, and be holy unto your God.