Jezekiel 20:20

20 and hallow my sabbaths, and let them be a sign between me and you, that ye may know that I am the Lord your God.

Jezekiel 20:20 In-Context

18 And I said to their children in the wilderness, Walk not ye in the customs of your fathers, and keep not their ordinances, and have no fellowship with their practices, nor defile yourselves .
19 I the Lord your God; walk in my commandments, and keep mine ordinances, and do them;
20 and hallow my sabbaths, and let them be a sign between me and you, that ye may know that I am the Lord your God.
21 But they provoked me, and their children walked not in my commandments, and they took no heed to mine ordinances to do them, which a man shall do, he shall even live in them, and they profaned my sabbaths: then I said that I would pour out my wrath upon them in the wilderness, to accomplish mine anger upon them.
22 But I wrought so that my name might not be at all profaned before the Gentiles; and I brought them out in their sight.

The Brenton translation of the Septuagint is in the public domain.