Exodus 31:13-18 GW

13 "Say to the Israelites, 'Be sure to observe my days of worship. This will be a sign between me and you for generations to come so that you will know that I am the LORD who makes you holy.
14 "'Observe the day of worship because it is holy to you. Whoever treats it like any other day must be put to death. Whoever works on that day must be excluded from the people.
15 You may work for six days, but the seventh day is a day of worship, a day when you don't work. It is holy to the LORD. Whoever works on that day must be put to death.
16 The Israelites must observe this day of worship, celebrating it for generations to come as a permanent reminder of my promise.
17 It will be a permanent sign between me and the Israelites, because the LORD made heaven and earth in six days, and on the seventh day he stopped working and was refreshed.'"
18 The LORD finished speaking to Moses on Mount Sinai. Then he gave him the two tablets with his words on them, stone tablets inscribed by God himself.