Matthew 12:5

Or have ye not read in the Law how on the Sabbath days the priests in the Temple profane the Sabbath, and are blameless?

Jesus had a most disconcerting way of quoting Scripture to His enemies, which usually resulted in their chagrin and shameful rout. He has two examples for them: David, in fleeing before the wrath of Saul, came to the sanctuary of the Lord at Nob, 1 Samuel 21:1, where Ahimelech, the priest, gave him the show-bread, the bread of the countenance of God, from the table in the Holy Place. These consecrated bread-cakes were to be eaten by the priests only, Leviticus 24:8, and yet David, the great model of Jewish piety, ate of this hallowed bread with his men. And again: The priests, in the regular discharge of their duties, in sacrificing the burnt offerings in the morning and evening services of the Sabbath day, were technically transgressing the Sabbath law, with its absolute prohibition of work, thus, if one would argue from the standpoint of the Pharisees, actually profaning the Sabbath.