Or have you not read in the law, how that on the sabbath days the priests in the temple profane the sabbath, and are blameless?
All Commentaries on Matthew 12:5 Go To Matthew 12
John Chrysostom
AD 407
Do not reply that one does not free oneself from blame by noting that someone else is committing the same offense. Or that if the offender has no blame, his act becomes a rule for others to plead. Jesus was not satisfied with such reasoning. Instead, he concludes something more decisive: the deed itself in this case is no sin at all! This more than anything was the sign of a glorious victory: For here the Giver of the law was overriding the law. This victory occurs in a particular place, the temple, and on a particular day, the sabbath. One might even point to several levels of legal reversal, pertaining to the work that is done; it is done by priests, and more so, that it elicits no charges. For they remain guiltless. Do you see how many levels of argument Jesus is making in stating this case? They are “in the temple.” The persons involved are “priests.” The time is “the sabbath.” The act itself is “profane.” Note that he does not say gently that they “break” the sabbath law but more grievously that they “profane” it. Yet in all this they not only escape punishment but are free from blame, being “guiltless.” So do not treat the example of the priests in the same way as the example of David. For David’s case occurred only once, and was not done by a priest, and occurred due to an explicit need, and so was deserving of excuse. But the example of the priests was done repeatedly, every sabbath, was done by priests, and was done in the temple, and it too was of necessity. They were acquitted of charges not by special pleading or indulgence but on reasonable grounds according to the principles of justice. The Gospel of Matthew, Homily