Zohar abstract concepts that are never completely expressed. The earlier part of the Zohar, also known as "Zohar 'Al haTorah" (Zohar on the Torah, זוהר על התורה) or "Midrash Rashbi", contains several smaller "books", as described below. This book was published in three volumes: Volume 1 on "Bereishit" (Genesis), Volume 2 on "Shemot" (Exodus) and Volume 3 on "Vayikra, Bamidbar and Devarim" (Leviticus, Numbers, and Deuteronomy). At the start of the first volume is printed a "Preface to the Book of the Zohar" (pages 1a to 14b). After this introduction is the Zohar's commentary on most of the parashahs of the
Leviticus 19 (26-36) and a general instruction to obey all of God's commands (37). The laws of Leviticus 19 are put in no obvious order, and as a result scholars tend to think that the chapter includes a collection of regulations from various sources. The practice of leaving a portion of crops in the field for poor people or foreigners to use, mentioned in verses 9 and 10, reappears in the second chapter of the book of Ruth. In Judaism, the whole chapter is part of the weekly Torah portion (parashah) "Kedoshim" () which comprises Leviticus 19:1-20:27. Leviticus 19 Leviticus 19 is