Final answer:
The passage discusses Peter proclaiming that Jesus, whom the people crucified, is both the Lord and the Messiah. Peter instructs the people to repent, be baptized, and receive the forgiveness of sins and the gift of the Holy Spirit. This passage demonstrates the inclusive nature of salvation in Christianity.
Step-by-step explanation:
The subject of this question is Theology, as it refers to the teachings and beliefs surrounding Jesus Christ and the formation of Christianity.
In the passage, Peter, one of Jesus' apostles, tells the people that Jesus, whom they crucified, is both the Lord and the Messiah. This means that Jesus is the divine ruler and savior promised in Jewish scripture.
Peter instructs the people to repent, be baptized in the name of Jesus Christ for the forgiveness of their sins, and receive the gift of the Holy Spirit. This passage emphasizes the idea that salvation is available to all who believe, regardless of their background.