בידספיריט | Chabad: First Edition Sha'arei Avoda:

Chabad: First Edition Sha'arei Avoda: First Explanation on Tanya, Shklov 1821 Sha'arei Avoda, titled ”Sha'ar Avodas Habeinonim,” is the second part of the sefer Sha'ar Hayichud Vehayirah from Rabbi Aharon HaLevi Horowitz of Strashelye, a close disciple of Rabbi Shneur Zalman of Liadi. This first edition was published in Shklov 1821. Stefansky, Chassidus 589: This copy is identical to the other document described there with the introduction written part in print letters and part in Rashi script. [16], 12, 17-49, 52, 70, 60, 22 leaves | 16 cm