Mark 2:22-26
English Standard Version
23One Sabbath he was going through the grainfields, and as they made their way, his disciples began to pluck heads of grain.
24And the Pharisees were saying to him, "Look, why are they doing what is not lawful on the Sabbath?"
25And he said to them, "Have you never read what David did, when he was in need and was hungry, he and those who were with him:
26how he entered the house of God, in the time of Abiathar the high priest, and ate the bread of the Presence, which it is not lawful for any but the priests to eat, and also gave it to those who were with him?"