Jehovah Mekoddishkem, The Lord Who Sanctifies
It wasn’t their works or actions that sanctified them; God sanctified them because they had chosen to believe in Him.
Tell the people of Israel: ‘Be careful to keep my Sabbath day, for the Sabbath is a sign of the covenant between me and you from generation to generation. It is given so you may know that I am the Lord, who makes you holy. (Exodus 31:13)