Deuteronomy 22:12

Thou shalt make thee fringes upon the four quarters of thy vesture, wherewith thou coverest thyself.

The command was to make fringes upon the four corners of the garment with which a person covers himself. It was understood to prescribe a garment for men having a blue border with a fringe at each corner. The preceding verse was understood to explain that this garment should be made of one kind of material. The garment was given sacred significance, so that a prescribed blessing was to be said before putting it on.

It was worn by males from the age of thirteen at the morning services throughout the year, except on the day commemorating the destruction of the Temple, when it was worn at the evening service. In the synagogue it was worn like a shawl. Rabbinic teaching held that a longer garment and a broader band displayed greater piety and brought greater regard.