Ezekiel 20:12, 20-21

And I gave them my Sabbath days of rest as a sign between them and me. It was to remind them that I am the LORD, who had set them apart to be holy.

and keep my Sabbath days holy, for they are a sign to remind you that I am the LORD your God.’ “But their children, too, rebelled against me. They refused to keep my decrees and follow my regulations, even though obedience would have given them life. And they also violated my Sabbath days. So again I threatened to pour out my fury on them in the wilderness.