Who is Jesus teaching - not the scribes and pharisees, but his followers and disciples. The scibes and pharisees received no teaching from Jesus in this chapter. Read a little more reggie to get the context.
They received no teaching because they chose not to. And that was part of the point Christ was making. They could have learned. It was there for them to learn. Christ was offering it to them and they rejected Him preferring to hold on to their belief that the fact that they were descendants of Abraham, this alone made them holy. His followers and disciples learned because they were willing to be taught.