‘And he said to them, “The Son of man is lord of the sabbath.” '
And this was because as the Son of Man He was Lord of the Sabbath, that is, He was the overall authority who could make declarations of what was lawful to be done on the Sabbath Day. It was basically a claim to be the heaven appointed and heaven enthroned Messiah, thus setting Him up before God as having a higher authority than the Scribes, the Jewish teachers and arbiters of the Law.