Mark 2:23-26

And it came to pass, that he was going on the sabbath day through the grainfields; and his disciples began, as they went, to pluck the ears. And the Pharisees said unto him, Behold, why do they on the sabbath day that which is not lawful? And he said unto them, Did ye never read what David did, when he had need, and was hungry, he, and they that were with him? How he entered into the house of God when Abiathar was high priest, and ate the showbread, which it is not lawful to eat save for the priests, and gave also to them that were with him?