Youngsters putting on T'fillin. These are boxes with prayers in them, wrapped with leather cords around the arm and the skull. This practice comes from Deuteronomy: in the same passage that commands us to revere the words of God by putting them "on the doorposts of our house" (also known as a Mezuza), the verse continues by commanding us to put them (God's words) before our eyes and upon our arms.

Youngsters putting on T'fillin. These are boxes with prayers in them, wrapped with leather cords around the arm and the skull. This practice comes from Deuteronomy: in the same passage that commands us to revere the words of God by putting them "on the doorposts of our house" (also known as a Mezuza), the verse continues by commanding us to put them (God's words) before our eyes and upon our arms.