12 And the Lord said to Moses, 13 “Say to the people of Israel, ‘You shall keep my sabbaths, for this is a sign between me and you throughout your generations, that you may know that I, the Lord, sanctify you. 14 You shall keep the sabbath, because it is holy for you; every one who profanes it shall be put to death; whoever does any work on it, that soul shall be cut off from among his people. 15 Six days shall work be done, but the seventh day is a sabbath of solemn rest, holy to the Lord; whoever does any work on the sabbath day shall be put to death. 16 Therefore the people of Israel shall keep the sabbath, observing the sabbath throughout their generations, as a perpetual covenant. 17 It is a sign for ever between me and the people of Israel that in six days the Lord made heaven and earth, and on the seventh day he rested, and was refreshed.’ ”