Does Matthew 23:2-3 Mean Jesus Didn’t Abolish the Law?

You didn’t specify a passage in Matthew 23, but we infer you mean Matthew 23:2-3. Jesus addresses the crowds in Matthew 23:1-3:

Then said Jesus to the crowds and to his disciples, “The scribes and the Pharisees sit on Moses’ seat; so practice and observe whatever they tell you, but not what they do; for they preach, but do not practice. “

Jesus makes clear that the Pharisees’ authority applies to the Mosaic Law, which he elsewhere says he came to fulfill (Matt. 5:17-18). The Pharisees did not feel affirmed in their authority by Jesus. Rather, they viewed Jesus as a threat, which they elsewhere made clear in seeking his death (Matt.12:14).