Atos 8

36 Now as they went down the road, they came upon some water. And the eunuch said, See, here is water. What prevents me from being immersed?

37 Then Philip said, If you believe with all your heart, it is lawful. And he answered and said, I believe that Jesus Christ is the Son of God.

38 So he commanded the chariot to stand still. And both Philip and the eunuch went down into the water, and he immersed him.