"How he entered into the house of God, and did eat the shewbread, which was not lawful for him to eat, neither for them which were with him, but only for the priests? Mat 12:4
ANSWER: The corrupt Pharisees had added to the law of God and were slanderers. The disciples did not profane the Sabbath. Jesus said they were guiltless. Neither did David profane the Sabbath because the priest interpreted the law. He was the messenger of the LORD of hosts and His knowledge of the Sabbath was to show mercy.
Mat_12:7 But if ye had known what this meaneth, I will have mercy, and not sacrifice, ye would not have condemned the guiltless.
Mal_2:7 For the priest's lips should keep knowledge, and they should seek the law at his mouth: for he is the messenger of the LORD of hosts.