The Sermon on the Mount in the Gospel of Matthew (chapters 5, 6, and 7) became a foundational element of the religion of Christianity. The sermon is based on the traditions of Judaism and the Law of Moses, but with added interpretations of the teachings of Jesus of Nazareth. Matthew placed it at the beginning of Jesus' ministry, and its themes continued throughout the gospel.
This is a companion discussion topic for the original content at https://www.worldhistory.org/article/2547/sermon-on-the-mount/.