The Ethiopian Eunuch (Acts 8:26):

And the angel of the Lord spake unto Philip, saying, Arise, and go toward the south unto the way that goeth down from Jerusalem unto Gaza, which is desert.

 And he arose and went: and, behold, a man of Ethiopia, an eunuch of great authority under Candace queen of the Ethiopians,

 who had the charge of all her treasure, and had come to Jerusalem for to worship, Was returning, and sitting in his chariot read Esaias the prophet.

Then the Spirit said unto Philip, Go near, and join thyself to this chariot.

And Philip ran thither to him, and heard him read the prophet Esaias, and said, Understandest thou what thou readest? And he said, How can I, except some man should guide me?

And he desired Philip that he would come up and sit with him. The place of the scripture which he read was this,

He was led as a sheep to the slaughter; and like a lamb dumb before his shearer, so opened he not his mouth:

In his humiliation his judgment was taken away: and who shall declare his generation? for his life is taken from the earth.

And the eunuch answered Philip, and said, I pray thee, of whom speaketh the prophet this? of himself, or of some other man?

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

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?

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. 

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.

And when they were come up out of the water, the Spirit of the Lord caught away Philip, that the eunuch saw him no more: and he went on his way rejoicing.

But Philip was found at Azotus.

Note: The critically important answer to the eunuch’s question about qualification for baptism, as well as his response to that answer, shown here in the King James Bible, are scandalously omitted in modern bibles. 

Philip's answer to the eunuch, and the eunuch's response are crucial and obviously do need to be in the passage so that a person can understand what one must do to become a Christian, thus qualifying for baptism.

The reason for this omission is that modern bibles are translated from different (I believe inferior) manuscripts. 

Believers do not doubt the correctness of these extra word/words as properly applying to Jesus Christ, only whether they are properly part of this/these specific passages or not.5.