5 Or is it not said in the law, how the Sabbath is broken by the priests in the Temple and they do no wrong?

Matthew Henry's Commentary on Matthew 12:5

Commentary on Matthew 12:1-8

(Read Matthew 12:1-8)

Being in the corn-fields, the disciples began to pluck the ears of corn: the law of God allowed it, Deuteronomy 5:14. No law must be understood so as to contradict its own end. And as Christ is the Lord of the sabbath, it is fit the day and the work of it should be dedicated to him.