“Why is your teacher.” Matthew 9:11 and Matthew 9:14 are an interesting case study on how evil works to sow division and tear a group apart. Both the Pharisees and the disciples of John had questions about Jesus’ ministry. But the Pharisees were not really seeking an answer, and so they went to Jesus’ disciples and asked them about it. Their real motive in such an action was to discredit Jesus. The watchful Jesus saw the situation developing and stepped in and answered the question, but in a way that challenged the Pharisees to study the Word and rethink their position—which they never did.
In Matthew 9:14 the disciples of John had a question, but they went directly to Jesus and asked it. Jesus answered them too, but also in a way that would have caused John’s disciples to ponder the answer. Evil always works to break apart godly groups, and wise leaders are always on guard against those subtle attacks.