Ezekiel 20:12

20:12 I also gave them my Sabbaths as a reminder of our relationship, so that they would know that I, the Lord, sanctify them.

Ezekiel 20:20-21

20:20 Treat my Sabbaths as holy and they will be a reminder of our relationship, and then you will know that I am the Lord your God.” 20:21 “‘But the children rebelled against me, did not follow my statutes, did not observe my regulations by carrying them out (the one who obeys them will live by them), and desecrated my Sabbaths. I decided to pour out my rage on them and fully vent my anger against them in the wilderness.