The people are exhorted to observe the Sabbath (17:19–27; Sabbath laws are given in Exodus 20:8–11; 23:12; 34:21; Num. 15:32–36). “Be careful” is a frequent admonition in Deuteronomy. The instruction is to desist from public trading and from work generally. Reform and renewal start with specifics. Some have suggested that of the Ten Commandments Jeremiah singled out the fourth because it was …