When people say that Jesus got rid of the old laws or changed them, what they are saying is that Jesus contradicted his father (or himself). That’s what we have here. In the Old Testament god rested on the sabbath, and, indeed, anyone caught working on the sabbath was executed. That’s how seriously primitive people took this rule.
But when Jesus comes around and gets caught working on the sabbath, he’s like, “chill out, bro. Even my dad works on the sabbath,” thus contradicting Genesis.
What’s interesting about this contradiction is that this is precisely the reason why Christians work on the sabbath today. In other words, they live by this contradiction (except the Jehovah’s Witnesses and a few other small cultish sects). It’s incredibly easy to break one of the ten commandments when Jesus says it’s ok.
(Note: I borrowed the comic in the image above from Jared MacPhee. His website can be found here).