President Donald Trump penned a letter Sunday in honor of the late spiritual leader of the Chabad-Lubavitch Hasidic movement, marking the 31st anniversary of his passing.

The missive was addressed to The Ohel, which administers the gravesite of Rabbi Menachem Mendel Schneerson, who headed the Chabad Hasidic dynasty from 1951 until his death in 1994 at age 92.

In the letter, Trump hailed Rabbi Schneerson as “one of the most dynamic and influential faith leaders in modern history.”