Why Tefillin Are Worn on the Left Arm: The Meaning of “A Strong Hand”

“And it shall be for a sign upon your hand and for frontlets between your eyes, for with a strong hand the Lord brought us out of Egypt” (Shemot 13:16).

Why the Left Hand?

The Or HaChaim asks why God chose specifically the left hand for the mitzvah of tefillin. The Sages explain that the verse says “your hand” in a form that implies the weaker hand, meaning the left. They also note that the tefillin are placed opposite the heart, which is on the left side.

While these explanations are true, the Or HaChaim seeks a deeper reason, one rooted in the meaning of the verse itself: “for with a strong hand the Lord brought us out of Egypt.”

Two Dimensions of Divine Conduct

There are two primary modes through which God relates to the world.

One is called the “great hand,” which represents kindness and compassion.

The other is called the “strong hand,” which represents strength, judgment, and the execution of justice against those who do evil.

The Exodus as an Expression of Strength

During the Exodus from Egypt, God revealed Himself through the “strong hand.” The ten plagues were expressions of Divine power and judgment directed against Egypt.

This was not merely an act of salvation, but also an act of justice, demonstrating God’s ability to strike His enemies and redeem His people through strength.

Tefillin as a Living Reminder

For this reason, the mitzvah of tefillin is performed on the left hand, the “weaker” hand, which symbolically corresponds to the “strong hand” of God.

By placing the tefillin on the left arm, a person carries a physical reminder of the Divine power that brought about the Exodus. The act becomes a daily reenactment of that moment, connecting the individual to the memory of God’s strength and intervention.

Strength and Compassion

The Or HaChaim notes that in many places the Torah speaks of the “great hand,” referring to the harmony between mercy and judgment. However, in this context, the emphasis is specifically on the “strong hand,” as the Exodus was primarily a revelation of Divine strength and justice.

The placement of tefillin, therefore, is not arbitrary. It reflects a deep spiritual idea: that the redemption from Egypt came through Divine power, and that this power is meant to be remembered and internalized every day.