Help me understand this.

I have started reading the Old Testament to help my understanding of the New Testament. In Numbers 16, 32- 36; we see a man who collects wood on the Sabbath, and the Lord commands Israel to stone him to death. Yet, in the Gospel (the book and verse escapes me), we see that God (Jesus) tells us that the Sabbath was made for man, not the other way around. I don’t get it, God doesn’t change. So what is the Lord trying to say?

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