Yahweh: Whoever does any work on the Sabbath day must be put to death

"Observe the Sabbath, because it is holy to you. Anyone who desecrates it is to be put to death; those who do any work on that day must be cut off from their people."
Exodus 31:14

"For six days work is to be done, but the seventh day is a day of sabbath rest, holy to the LORD. Whoever does any work on the Sabbath day is to be put to death."
Exodus 31:15

"While the Israelites were in the wilderness, a man was found gathering wood on the Sabbath day. Those who found the man gathering wood brought him to Moses, Aaron, and the entire congregation, and because it had not been declared what should be done to him, they placed him in custody.
And the LORD said to Moses, 'The man must surely be put to death. The entire congregation is to stone him outside the camp.' So the whole congregation took the man outside the camp and stoned him to death, as the LORD had commanded Moses."
Numbers 15:32-36