Yechezkel 20:10-12

Therefore I caused them to go forth out of Eretz Mitzrayim, and brought them into the midbar. And I gave them My chukkot, and made known to them My mishpatim, which if ha'adam does, he shall even live in them. Moreover also I gave them My Shabbatot, to be an Ot between Me and them, that they might know that I am HASHEM that set them apart as kodesh.