Matthew 12
The conflict with the Pharisees reaches its first climax in chapter 12 with two Sabbath controversies (grain plucking, withered hand healing), each of which Jesus interprets through Hosea 6:6 (I desire mercy, not sacrifice) and the Lord of the Sabbath claim. The healing of a blind and mute demoniac provokes the Beelzebul accusation — Jesus casts out demons by the prince of demons — which Jesus refutes with the divided kingdom argument and the strong man parable, then interprets through the impossible-to-remain-neutral principle: whoever is not with me is against me. The unforgivable sin (blasphemy against the Holy Spirit) is defined as the persistent attribution of Jesus' Spirit-powered work to Satan — the willful rejection of the evidence that makes repentance possible. The sign of Jonah is promised as the only sign for an evil and adulterous generation: three days and nights in the heart of the earth, as Jonah was in the great fish. The chapter ends with Jesus redefining family: whoever does the will of my Father in heaven is my brother and sister and mother.
Matthew 12:14
But the Pharisees went out and conspired against him, how to destroy him. The healing that should have produced thanksgiving and affirmation produces instead the first explicit murder conspiracy in Matthew's Gospel. The Pharisees who could not answer the legal argument and could not deny the healing go out and take counsel together about how to destroy Jesus. The conspire-to-destroy response to the evidence of mercy communicates the depth of the opposition: the miracle did not soften them.
Matthew 12:13
Then he said to the man: stretch out your hand. And the man stretched it out, and it was restored, healthy like the other. Jesus heals the man after making the legal argument — the healing is the demonstration that what he has argued is true. The man who stretched out his withered hand in response to the command received the hand's restoration in the act of obedience. The healing vindicates the legal argument and challenges the Pharisees' accusation with the evidence of restored humanity.
Matthew 12:1
At that time Jesus went through the grainfields on the Sabbath. His disciples were hungry, and they began to pluck heads of grain and to eat. The Sabbath conflict that opens chapter 12 is the first major confrontation with the Pharisees over the interpretation of the Torah. The disciples' act — plucking heads of grain while walking through a field — was specifically permitted in Deuteronomy 23:25 (you may pluck grain with your hand). The Pharisaic objection is not to the plucking but to its performance on the Sabbath.
Matthew 12:2
But when the Pharisees saw it, they said to him: look, your disciples are doing what is not lawful to do on the Sabbath. The Pharisaic accusation — doing what is not lawful — reflects the oral tradition that interpreted the Sabbath's prohibition on work to include harvesting, and the plucking of grain was classified as harvesting. The accusation is addressed to Jesus, not to the disciples, because the rabbi is responsible for his students' conduct. The Pharisees hold Jesus accountable for what his disciples do.