Lord of the Sabbath
The Lord of the Sabbath is an expression describing Jesus which appears in all three Synoptic Gospels, Matthew 12:1-8, Mark 2:23-28 and Luke 6:1-5. These sections each relate an encounter between Jesus, his Apostles and the Pharisees, the first of the four "Sabbath controversies". 
According to the Gospel of Mark:
One Sabbath, Jesus was going through the grainfields, and as his disciples walked along, they began to pick some heads of grain. The Pharisees said to him, "Look, why are they doing what is unlawful on the Sabbath?" He answered, "Have you never read what David did when he and his companions were hungry and in need? In the days of Abiathar the high priest, he entered the house of God and ate the consecrated bread, which is lawful only for priests to eat. And he also gave some to his companions." Then he said to them, "The Sabbath was made for man, not man for the Sabbath. So the Son of Man is Lord even of the Sabbath."
There are different interpretations of the reference to the Son of man statement in Matthew 12:1-8 that "for the Son of man is Lord of the Sabbath". It may mean that Jesus is claiming to be the Lord or that his Apostles are entitled to do as they wish on the Sabbath.