Verse 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, inquire 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.
Verse 40. Be ye holy - Purged from sin and sincerely devoted to God.
Verse 41. I am the Lord your God - Though I am justly displeased with you for your frequent rebellions, for which also I will keep you forty years in the wilderness, yet I will not utterly cast you off, but will continue to be your God.