The vision of Peter at Joppa was meant to teach him that

The vision of Peter at Joppa was meant to teach him that in Christianity, there is no racial discrimination. According to the story in the Bible, Peter had a vision of a sheet full of different types of animals which were considered unclean by Jewish law. A voice told him to kill and eat them, but Peter refused, saying that he had never eaten anything impure. The voice responded by saying, "Do not call anything impure that God has made clean." This happened three times. Later, Peter received a message from a Gentile (non-Jewish) man named Cornelius, who asked Peter to come and preach to his household. Despite his initial reluctance, Peter accepted the invitation and realized that the vision was a message from God telling him that Gentiles were not unclean, and that Christianity was open to people of all races and nationalities.