Deuteronomy's version of the Ten Commandments repeats the Sabbath instruction in nearly identical terms but changes its stated reason, grounding the seventh day rest in the memory of slavery in Egypt and the exodus from it rather than in the pattern of creation that Exodus gives. Scholars who study the book of Exodus have taken the difference seriously rather than treating it as incidental, since it means the tradition preserved two distinct and complementary justifications for the same practice, one cosmic and one historical, without ever choosing between them or harmonizing them into one account. Both versions agree on the practice itself, and later Jewish observance draws on both reasons together, treating Sabbath rest as simultaneously an imitation of the world's own creation and a lived reminder of liberation from servitude. The instruction's insistence on rest for servants and animals as well as for the household head became a recurring point of ethical reflection in later Jewish commentary, read as building a limit on labor's demands into the structure of the week itself rather than leaving that limit to individual conscience or to the discretion of whoever held authority over a given household.