Ezekiel 20:18-20

And I said to their children in the waste land, Do not be guided by the rules of your fathers or keep their orders or make yourselves unclean with their images: I am the Lord your God; be guided by my rules and keep my orders and do them: And keep my Sabbaths holy; and they will be a sign between me and you so that it may be clear to you that I am the Lord your God.