Tefillin are small black leather boxes containing scrolls of parchment inscribed with verses from the Torah. They are worn by observant Jewish men during weekday morning prayers as a commandment to bind the words of God to their hearts and minds. One box is placed on the arm, while the other is placed on the forehead, symbolizing the connection between thought and action. The practice of wearing tefillin is rooted in the Hebrew Bible, specifically in the passages that instruct followers to keep God's words close. Tefillin serve as a physical reminder of faith and commitment to Judaism, enhancing the spiritual experience during prayer.