Eunuch further only appears in the New Testament in Jesus’ teaching in Matthew 19:10–12: For there are eunuchs who have been so from birth, and there are eunuchs who have been made eunuchs by men, and there are eunuchs who have made themselves eunuchs for the sake of the kingdom of heaven.
The first two indications by Jesus in Matthew 19 are known in Jewish tradition, the third one is special. Should this be taken literally or figuratively? With a figurative explanation it could be about voluntarily giving up marriage and procreating children, because of the kingdom. The joy over God’s kingdom is so great that someone is willing to devote his whole life to it and therefore even refrain from marriage! Think of celibacy. Some read it as a variation on the words of Jesus: when your eye or hand lead you to sin, then you can better pluck out your eye and cut off your hand to be saved. The choice for Christ has the right of way and can mean a radical break with holding on to a specific sin. In this way, castration could also be a radical intervention to prevent temptations of sexual derailments and be totally available for the kingdom.
27 And he rose and went. And there was an Ethiopian, a eunuch, a court official of Candace, queen of the Ethiopians, who was in charge of all her treasure. He had come to Jerusalem to worship