Editing Rabbeinu Tam Teffilin (section)

== Ruling in Shulchan Aruch ==
The Beis Yosef writes in Shulchan Aruch: "A yerei shamayim should fulfill both opinions and make two pairs of tefillin and lay both." And in the Alter Rebbe's Shulchan Aruch states that "every yerei shamayim should fulfill both opinions and make two pairs of tefillin and lay them."

According to pnimiyus haTorah, Rabbeinu Tam's tefillin require additional kedusha from the person laying them, and therefore many communities practiced starting to lay them only after marriage.

Chabad chassidim previously practiced starting to lay Rabbeinu Tam's tefillin only after marriage. Additionally, 18-year-old bochurim who wanted to also lay Rabbeinu Tam's tefillin needed to ask the Rebbe about it, sometimes the Rebbe instructed to consult with the mashpia about it.

At the [[Purim]] [[farbrengen]] of 1976, the Rebbe instructed to start laying them from Bar Mitzvah especially to overcome the darkness of [[Galus (Exile)|galus]] and hasten the [[Geulah - Redemption|geulah]]. After some time, the Rebbe instructed not only from Bar Mitzvah but even earlier - from the time of starting to lay tefillin. Since then, it has been customary in Chabad communities to start laying Rabbeinu Tam's tefillin together with Rashi's tefillin in the time before Bar Mitzvah.

The time for laying Rabbeinu Tam's tefillin is specifically immediately after Shacharis.