they.

Acts 2:38
Peter replied, "Repent and be baptized, every one of you, in the name of Jesus Christ for the forgiveness of your sins, and you will receive the gift of the Holy Spirit.

Acts 8:12, 16
But when they believed Philip as he preached the gospel of the kingdom of God and the name of Jesus Christ, they were baptized, both men and women. . . .

Romans 6:3, 4
Or aren't you aware that all of us who were baptized into Christ Jesus were baptized into His death? . . .

1 Corinthians 1:13-15
Is Christ divided? Was Paul crucified for you? Were you baptized into the name of Paul? . . .

1 Corinthians 10:2
They were all baptized into Moses in the cloud and in the sea.