EXO 31:13

13 Speak thou to the sons of Israel, and thou shalt say to them, See ye that ye keep my sabbath, for it is a sign betwixt me and you in your generations; that ye know, that I am the Lord, which hallow[[eth]] you. (Speak thou to the Israelites, and thou shalt say to them, See ye that ye keep my Sabbath, for it is a sign between me and you for all generations to come; so that ye know, that I am the Lord, who halloweth you.)