Genesis 2:3

And he said to them, “This is what Yahweh has spoken: Tomorrow is a sabbath observance, a holy sabbath to Yahweh. Bake what you will bake and boil what you will boil, and all that is in excess put aside to be kept until morning.”

“For in six days Yahweh made the heavens and the earth, the sea and all that is in them, and rested on the seventh day; therefore Yahweh blessed the sabbath day and made it holy.

‘Six days work may be done, but on the seventh day there is a sabbath of complete rest, holy to Yahweh; whoever does any work on the sabbath day shall surely be put to death.

“It is a sign between Me and the sons of Israel forever; for in six days Yahweh made heaven and earth, but on the seventh day He rested and was refreshed.”