As this company [Philip and the eunuch] continued along the
road, they came upon a certain pool of water. The eunuch
exclaimed: "Look, here is water. What is
there to hinder me from being immersed?" How did he
learn of the necessity of being baptized? It must be inferred
that in preaching "Jesus," Philip had proclaimed the
Lord's plan as well. The eunuch recognized his
responsibility to Christ, hence wanted to identify with the
Savior's death, burial, and resurrection in this act that so
fittingly portrays those events (cf. Romans 6:3-4;
Colossians 2:12).