Exodus 31:12–17
12 The Lord spoke to Moses, saying,
13 “But as for you, speak to the sons of Israel, saying, ‘aYou shall surely observe My sabbaths; for this is ba sign between Me and you throughout your generations, that you may know that I am the Lord who sanctifies you.
14 ‘Therefore you are to observe the sabbath, for it is holy to you. aEveryone who profanes it shall surely be put to death; for whoever does any work on it, that person shall be cut off from among his people.
15 ‘aFor six days work may be done, but on the seventh day there is a bsabbath of complete rest, holy to the Lord; cwhoever does any work on the sabbath day shall surely be put to death.
16 ‘So the sons of Israel shall observe the sabbath, to 1celebrate the sabbath throughout their generations as a perpetual covenant.’
17 “aIt is a sign between Me and the sons of Israel forever; bfor in six days the Lord made heaven and earth, but on the seventh day He ceased from labor, and was refreshed.”