Numbers 15:37-40

³⁷And the Lord said to Moses,

³⁸Say to the children of Israel that through all their generations they are to put on the edges of their robes an ornament of twisted threads, and in every ornament a blue cord;

³⁹So that, looking on these ornaments, you may keep in mind the orders of the Lord and do them; and not be guided by the desires of your hearts and eyes, through which you have been untrue to me:

⁴⁰And that you may keep in mind all my orders and do them and be holy to your God.