There are two accounts of the Ten Commandments, in Exodus 20 and in Deuteronomy 5. One of the main divergences in the two texts is in the Fourth Commandment, the Shabbat. The Rabbis taught that both texts were simultaneously pronounced, indicating a basic unity, or complementary nature. In Exodus the reason for Shabbat is the fact that G-d created the world in six days and rested on the seventh. In Deuteronomy Shabbat commemorates Egyptian slavery. In the first, "G-d blessed the seventh day and hallowed it”; in the second, "G-d commanded you to make the Shabbat day." Shabbat has social...