Church Fathers on Mark 2:28

We read also in the following part, that they who came and went away were many, and that they had not time enough to take their food, wherefore, according to man’s nature, they were hungry.

For it was a precept in Israel, delivered by a written law, that no one should detain a thief found in his fields, unless he tried to take something away with him. For the man who had touched nothing else but what he had eaten they were commanded to allow to go away free and unpunished. Wherefore the Jews accused our Lord’s disciples, who were plucking the ears of corn, of breaking the sabbath, rather than of theft.

For David, when flying from the face of Saul [1 Sam 21] went to the Chief Priest, and ate the shew-bread, and took away the sword of Goliath, which things had been offered to the Lord. But a question has been raised how the Evangelist called Abiathar at this time High Priest, when the Book of Kings calls him Abimelech.