Numbers 15:37-39

³⁷The Lord also spoke to Moses, saying, ³⁸“Speak to the sons of Israel, and tell them that they shall make for themselves tassels on the corners of their garments throughout their generations, and that they shall put on the tassel of each corner a cord of blue. ³⁹It shall be a tassel for you to look at and remember all the commandments of the Lord, so as to do them and not follow after your own heart and your own eyes, after which you played the harlot,