Mk 2:23-28, Mt 12:1-4, Lk 6:1-5
In the Old Testament, David once ate the showbread, which was not to be eaten except by the priests. (1 Samuel 21:5-7)
1 Samuel 21:5 And David answered the priest, and said unto him, Of a truth women have been kept from us about these three days, since I came out, and the vessels of the young men are holy, and the bread is in a manner common, yea, though it were sanctified this day in the vessel. 6 So the priest gave him hallowed bread: for there was no bread there but the shewbread, that was taken from before the Lord, to put hot bread in the day when it was taken away. 7 Now a certain man of the servants of Saul was there that day, detained before the Lord; and his name was Doeg, an Edomite, the chiefest of the herdmen that belonged to Saul.
When the Pharisees saw Jesus' disciples cut and ate the ears of wheat on the Sabbath, they criticized Jesus. Then Jesus said that David also ate the showbread, which was not to be eaten except by the priests. And Jesus revealed that Jesus Himself was the Lord of the Sabbath. (Mark 2:23-28, Mark 12:1-4, Luke 6:1-5)
Mark 2:23 And it came to pass, that he went through the corn fields on the sabbath day; and his disciples began, as they went, to pluck the ears of corn. 24 And the Pharisees said unto him, Behold, why do they on the sabbath day that which is not lawful? 25 And he said unto them, Have ye never read what David did, when he had need, and was an hungred, he, and they that were with him? 26 How he went into the house of God in the days of Abiathar the high priest, and did eat the shewbread, which is not lawful to eat but for the priests, and gave also to them which were with him? 27 And he said unto them, The sabbath was made for man, and not man for the sabbath: 28 Therefore the Son of man is Lord also of the sabbath.
Mark 12:1 And he began to speak unto them by parables. A certain man planted a vineyard, and set an hedge about it, and digged a place for the winefat, and built a tower, and let it out to husbandmen, and went into a far country. 2 And at the season he sent to the husbandmen a servant, that he might receive from the husbandmen of the fruit of the vineyard. 3 And they caught him, and beat him, and sent him away empty. 4 And again he sent unto them another servant; and at him they cast stones, and wounded him in the head, and sent him away shamefully handled.
Luke 6:1 And it came to pass on the second sabbath after the first, that he went through the corn fields; and his disciples plucked the ears of corn, and did eat, rubbing them in their hands. 2 And certain of the Pharisees said unto them, Why do ye that which is not lawful to do on the sabbath days? 3 And Jesus answering them said, Have ye not read so much as this, what David did, when himself was an hungred, and they which were with him; 4 How he went into the house of God, and did take and eat the shewbread, and gave also to them that were with him; which it is not lawful to eat but for the priests alone? 5 And he said unto them, That the Son of man is Lord also of the sabbath.