Ellicott's Commentary for English Readers - Matthew 12:3
(3) Have ye not read . . .?—The question was an appeal to the Pharisees on the ground where they thought themselves strongest. For them it was an argument à fortiori. Would they accuse David of sacrilege and Sabbath-breaking because he, in a case of urgent need, set at nought the two-fold law of ordinances? If they shrank from that, was it not inconsistent to condemn the disciples of Jesus for a far lighter transgression? read more
Ellicott's Commentary for English Readers - Matthew 12:2
(2) When the Pharisees saw it.—In the position in which the narrative stands in the other two Gospels, the Pharisees would appear as belonging to the company that had come down from Jerusalem to watch and accuse the new Teacher (Luke 5:17). He claimed the power to forgive sins, He ate and drank with publicans and sinners. Now they found that He was teaching men to dishonour the Sabbath, as He had already taught them in Jerusalem (John 5:10; John 5:16). read more