Numbers 15:39

For a fringe — That is, the ribband, shall be unto you, shall serve you for a fringe, to render it more visible by its distinct colour, whereas the fringe without this was of the same piece and colour with the garment, and therefore less observeable. That ye seek not — Or, enquire not for other rules and ways of serving me than I have prescribed you. Your own heart, and eyes — Neither after the devices of your own hearts, as Nadab and Abihu did when they offered strange fire; nor after the examples of others which your eyes see, as you did when you were set upon worshipping a calf after the manner of Egypt. The phylacteries worn by the Pharisees in our Lord's time, were a different thing from these. Those were of their own invention: these were a divine institution.