Present-day editions divide the Book of Exodus into 40 chapters. This practice is not rooted in Jewish tradition but was borrowed from Christian Bibles. In the late Middle Ages, the Church forced Jews to engage in disputations, which usually focused upon the interpretation of scriptural passages. This necessitated a common, standardized system of reference, and so the Christian chapter and verse numberings were introduced into the Hebrew manuscript Bibles by Rabbi Solomon ben Ishmael (ca. 1330).1
Editorial Note: This is an authorized excerpt from “The JPS Torah Commentary: Exodus” published by the Jewish Publication Society.