Many biblical texts mention eunuchs (εὐνοῦχος, סיר סִָ ). In the Hebrew Bible the term sārîs appears mainly as an element of the administrative apparatus. In the New Testament the image of the eunuch becomes the subject of theological reflection. In the Gospel of Matthew, Christ says that there are “Eunuchs who have made themselves Eunuchs for the kingdom of heaven” (Matthew 19:12). The article examines this verse, its Sitz im Leben, and traces its influence on both Christian theology and the religious practice of the followers of Christ. For a long time, the eunuchs in Matthew 19:12 have been seen by commentators as a model of chastity, an ideal member of the Christian Church, a prototype of a monk. However, the analysis of ancient texts shows how morally ambiguous the image of the eunuch was. In the ancient Mediterranean, the eunuch was the epitome of transgression of all norms related to family and sexual life. Through this image, everything that seemed eternal and reasonable was called into question. Hence, the image of eunuch given as a positive ideal denied the triumphant heterosexual binary model in which such things as family, gender, and gender identity were inscribed.