On the Day of Pentecost, when Christ established His Church, Peter and the other Apostles were there. Peter was preaching about Jesus and when the multitudes heard him, in verse 37, they asked, “Men and brethren what shall we do?” Peter answered in verse 38, “Repent, and let every one of you be baptized in the name of Jesus Christ for the remission of sins; and you shall receive the Holy Spirit.”