Did Jesus teach about the church during his earthly ministry?

Les explains that in Christ's earthly ministry there is nothing of the church, and there is no church language. It is Christ dealing under the law with the Jew under the law. He constantly made clear that this was all under law, with no word saying they no longer had to keep temple worship or the commandments. For example, healed lepers were told to present themselves to the priests, as the law demanded. The rich young ruler was told to keep the commandments. Even in the early chapters of Acts, the twelve apostles were still meeting at the temple, and no one had told them they were not under the law. The law was still in force.