Numbers 15:39

and it shall be unto you for a fringe, a tassel, that ye may look upon it, and remember all the commandments of the Lord, and do them, and that ye seek not after your own heart and your own eyes, after which ye use to go a-whoring; they should not act according to the ideas suggested by the lust of the flesh and the lust of the eyes, for the result would surely be spiritual unfaithfulness;