Note 7 at Acts 8:36: Judging from the eunuch's lack of understanding of the scriptures in Isaiah 53, it is not probable that he knew, from scripture, about water baptism. It can therefore be assumed that Philip included instruction about water baptism in his preaching of Jesus (v. 35). However, as explained in note 9 at Mark. 16:16, page 564 and note 2 at Acts 2:38, page 582, water baptism is only a sign of salvation and is not something we do in order to obtain salvation.