Likutei Moharan, Part II 94:1/ליקוטי מוהר"ן·תנינא צ״ד:א׳

1I heard from the Rebbe’s holy mouth that he had written a lesson on the topic of Rosh HaShanah, showing that it is imperative to travel to tzaddikim for Rosh HaShanah.

2Explained there are the three roshim (heads) which come together on Rosh HaShanah when one merits being by the tzaddik.

3The tzaddik is the concept of rosh, for he is “rosh b’nei Yisrael (the head of the Children of Israel).”

4Rosh HaShanah is also the concept of rosh, because it is the rosh (head) of the year.

5And each person comes with his intellect and brain to the tzaddik, and binds the brain and intellect inside his head—which is also the concept of rosh—to the tzaddik—who is “the rosh of the Children of Israel” (Exodus 30:12)—on Rosh HaShanah.

6Thus it is that the three roshim come together.

7[The Rebbe] had an entire lesson on this, but I did not merit receiving it.