Exodus 31:13

You are to speak to the people of Israel and say , Above all you shall keep my Sabbaths , for this is a sign between me and you throughout your generations , that you may know that I, the Lord , sanctify you.

“Say to the Israelites, ‘You must observe my Sabbaths. This will be a sign between me and you for the generations to come, so you may know that I am the Lord, who makes you holy.

Speak thou also unto the children of Israel, saying, Verily my sabbaths ye shall keep : for it is a sign between me and you throughout your generations; that ye may know that I am the Lord that doth sanctify you.