"Ye shall keep the Sabbath, for it is holy unto you" (Ex. 31:14). What is the keeping of the Sabbath? Neither to do any work thereon, nor to kindle fire thereon, neither to take forth nor to bring in beyond the Techum (limit) of the Sabbath even one foot, nor to fetch in his hand something which is not his food nor the food for his cattle. This is the keeping of the Sabbath, as it is said, "Wherefore the children of Israel shall keep the Sabbath" (Ex. 31:16).
"It is a sign between me and the children of Israel for ever" (Ex. 31:17). The Holy One, blessed be He, said: This (Sabbath) have I given to Israel as a sign between Me || and them; for in the six days of creation I fashioned all the world, and on the Sabbath I rested, therefore have I given to Israel the six days of work, and on the Sabbath, a day (for) blessing and sanctification, for Me and for them; therefore it is said, "Between me and the children of Israel it is a sign for ever" (ibid.).