How do we know? Because the commandment regarding the observance of the Sabbath in the Exodus 20 list was edited, we’ve learned through biblical scholarship, to bring it into conformity with the seven-day story of creation with which the Hebrew Bible opens. That Genesis chapter, we now know, was one of the last parts of the Hebrew scriptures to be composed. It was the product of the Jews living in the Babylonian captivity, which ended near the end of the sixth century BCE.
