Ezekiel 20:5

20:5 and say to them:

“‘This is what the sovereign Lord says: On the day I chose Israel I swore to the descendants of the house of Jacob and made myself known to them in the land of Egypt. I swore to them, “I am the Lord your God.”

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.