Baptism

mt 28:19

acts 8:35-38

35 Then Philip opened his mouth, and began at the same scripture, and preached unto him Jesus.

36 And as they went on their way, they came unto a certain water: and the eunuch said, See, here is water; what doth hinder me to be baptized?

37 And Philip said, If thou believest with all thine heart, thou mayest. And he answered and said, I believe that Jesus Christ is the Son of God.

38 And he commanded the chariot to stand still: and they went down both into the water, both Philip and the eunuch; and he baptized him.

Acts 10:47-48

1 Peter 2:20 -21

Which sometime were disobedient, when once the longsuffering of God waited in the days of Noah, while the ark was a preparing, wherein few, that is, eight souls were saved by water. The like figure whereunto even baptism doth also now save us (not the putting away of the filth of the flesh, but the answer of a good conscience toward God,) by the resurrection of Jesus Christ:

Why had the believers in Samaria not received the Holy Spirit (Acts 8)? | GotQuestions.org