He’s Lord of the Sabbath because back in Genesis He created the the seventh day of rest, the Sabbath, (See Gen 2:2,3) and more than that, He is the Sabbath. More accurately, He is our Sabbath. You see, sabbath is all about rest and peace. Because of this, it is also about trust for you cannot truly have rest or peace unless you have trust, trust in the Almighty. Jesus embodies this rest, peace and trust.