Yesod Yitzchak, Part I – kabbalistic and Chassidic teachings on Brit Milah; Part II – Halichot Olam, practices and segulot, by R. Yitzchak Eizik HaLevi of Zuravitz (Żurawica). Zhovkva: printer not indicated, [1810]. First edition.
Order of study for the night preceding a Brit Milah (Vach Nacht) on leaves 41-47 (compiled from the Zohar).
The author, R. Yitzchak Eizik HaLevi (1735-1783), was a kabbalist and hidden tzaddik, associate of the Baal Shem Tov. He also authored Raza Meheimna and Otiyot DeRabbi Yitzchak.

[5], 5-69 leaves. 22 cm. Fair condition. Stains. Wear. Open tears to title page and other leaves, affecting text in several places, mostly repaired with paper. Minor worming affecting text. Leaves trimmed with slight damage to headings in several places. Handwritten inscriptions. New leather binding.