The Bar Mitzvah Maamar “Issa B’Midrash Tehillim”
was recited by the Rebbe Rashab (the fifth Lubavitcher Rebbe) on his Bar Mitzvah.
It was also one of the discourses recited by the Previous Rebbe at his Bar Mitzvah.
It is customary among Lubavitcher families for the Bar Mitzvah boy to recite this Maamar.

Our goal is to make this Maamar accessible both to the Bar Mitzvah boy
and to his audience. Most important is that the theme of the Maamar,
 the cosmic importance of the mitzvah of tefillin, should bring blessing on the Jewish people.