Christ and David
Christ Jesus was very flexible.
But it is interesting that he referred to David when he defended his disciples from their enemies. It means that Christ Jesus admitted a kind of authority in David in terms of the history of Israelites.
That is why we should not neglect the Old Testaments where the life of David was recorded.
Other than David, it was mostly Moses and Abraham that Christ Jesus referred to in His mission. It was not Alexander the Great and Caesar.
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Mat 12:1 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.
Mat 12:2 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.
Mat 12:3 But he said unto them, Have ye not read what David did, when he was an hungred, and they that were with him;