Tefillin are biblical in origin, and are commanded within the context of several laws outlining a Jew's relationship to God. "And you shall love the Lord your God with all your heart, with all your soul, and with all your might. Take to heart these instructions with which I charge you this day. Impress them upon your children. Recite them when you stay at home and when you are away, when you lie down and when you get up. Bind them as a sign on your hand and let them serve as a frontlet between your eyes" (Deuteronomy 6:5-8).Aharon's Jewish Books and Judaica
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