Matthew 12:1-3

1 At that time Jesus went on the sabbath day through the corn; and his disciples were an hungred, and began to pluck the ears of corn, and to eat.
2 But when the Pharisees saw it, they said unto him, Behold, thy disciples do that which is not lawful to do upon the sabbath day.
3 But he said unto them, Have ye not read what David did, when he was an hungred, and they that were with him;