What Is That Box on Their Forehead? (Tefillin Explained)

You are on a morning flight. The man in 14C stands up, opens a small velvet bag, and begins strapping black leather boxes to his arm and forehead. He wraps a thin leather strap around his arm seven times, places a box between his eyes, and starts quietly reading from a small book while swaying gently.

You have just seen someone put on tefillin.

What They Are

Tefillin (teh-FILL-in) are two small black leather boxes, each attached to long leather straps:

• Shel rosh — worn on the forehead, centered between the eyes and above the hairline
• Shel yad — worn on the upper left arm (right arm for lefties), with the strap wound seven times down the forearm and then wrapped around the hand and fingers

Each box contains four passages from the Torah, handwritten on parchment by a sofer (scribe) using a quill and special ink.

What Is Inside

The four passages are:

1. Exodus 13:1-10 — Remember the Exodus from Egypt
2. Exodus 13:11-16 — Consecrate every firstborn to G-d
3. Deuteronomy 6:4-9 — "Hear, O Israel, the Lord is our G-d, the Lord is One" (the Shema)
4. Deuteronomy 11:13-21 — Love G-d with all your heart, teach these words to your children

In the arm box, all four passages are written on a single parchment. In the head box, each passage is on a separate parchment in its own compartment. The scrolls are tiny — the boxes are only about 1.5 inches square.

Why They Wear Them

The Torah commands it directly: "You shall bind them as a sign on your hand, and they shall be as frontlets between your eyes" (Deuteronomy 6:8). The placement is specific and literal:

• On the arm, facing the heart — to direct emotions and actions toward G-d
• On the head, between the eyes — to direct thoughts and intellect toward G-d

The strap on the hand is wound to form the Hebrew letter shin (ש), one of the letters of G-d's name. The entire apparatus turns the body into a living expression of devotion.

When They Are Worn

• Weekday mornings only — Sunday through Friday during the morning prayer service (Shacharit)
• Not on Shabbat or holidays — tefillin are called an "ot" (sign) of the covenant, and Shabbat is already an ot. Wearing a sign on top of a sign is unnecessary.
• Duration: 20-45 minutes (the length of morning prayers)

Who Wears Them

• Jewish men from age 13 (after bar mitzvah)
• In a very small number of communities, some women choose to wear tefillin — this is accepted in certain Modern Orthodox and egalitarian circles but not in Hasidic or traditional Yeshivish communities
• Boys often begin practicing a few weeks before their bar mitzvah

What You Need to Know

If you see someone putting on tefillin on a plane, train, or in a park:

• They are praying. This takes about 20-30 minutes.
• Do not interrupt them.
• Do not stare, photograph, or ask questions while they are in the middle of it.
• After they are done, they are usually happy to explain if you ask politely.

If you are a security officer or flight attendant: Tefillin are religious articles, not security threats. They have been mistaken for explosive devices on planes (this has actually happened, resulting in emergency landings). They are leather boxes containing parchment. They are harmless.

The Cost

A set of tefillin costs $400-$2,000+ depending on quality:

• Basic kosher set: $400-$600
• Mehudar (enhanced quality): $800-$1,500
• Top quality (Arizal or Rambam style): $1,500-$3,000+

The price reflects the handwork: each set takes a sofer days to write, the leather must be from a kosher animal and hand-shaped, and the boxes must be perfectly square. Like a Torah scroll, tefillin are handmade religious artifacts — not manufactured products.

A boy typically receives his first pair at his bar mitzvah and may use the same set for decades. They are among the most treasured personal possessions in Orthodox life.