Yevamot 84A

הכלאים וטרפה ויוצא דופן, טומטום ואנדרוגינוס ⁠— לא קדושין ולא מקדישין.

Forbidden crossbred livestock, an animal with a condition that will cause it to die within 12 months [tereifa], an animal delivered through the abdominal wall, and an animal that is a tumtum or a hermaphrodite do not become sacred and do not render another animal sacred in their place.

ואמר שמואל: לא קדושין ⁠— בתמורה. ולא מקדישין ⁠— בעושה תמורה. שמע מינה.

And Shmuel said: They do not become sacred by way of substitution, i.e., if one had an animal that had been designated as an offering, and he wished to substitute one of these animals for it, the substituted animal does not become sacred. And they themselves do not render another animal sacred when it is made a substitute for them. If one designated one of these animals as an offering and he wished to substitute another animal for it, it does not become sacred. The Talmud concludes: Learn from this that R' Eliezer does not consider a hermaphrodite to be a proper male.

רבי אליעזר אומר: חייבין עליו סקילה כזכר. תניא, אמר רבי: כשהלכתי ללמוד תורה אצל רבי אלעזר בן שמוע, חברו עלי תלמידיו כתרנגולים של בית בוקיא, ולא הניחוני ללמוד אלא דבר אחד במשנתינו ⁠— רבי אליעזר אומר: אנדרוגינוס חייבין עליו סקילה כזכר.

It is taught in the Mishnah that R' Eliezer says: If one had sex with a hermaphrodite, one is liable to be punished with stoning on his account as if one had sex with a male. It is taught on this matter in a baraita that R' Yehuda HaNasi says: When I went to learn Torah from R' Elazar ben Shamua, his students joined together against me like the roosters of Beit Bukya, highly aggressive animals that do not allow other creatures to remain among them, and they did not let me learn there. Therefore, I managed to learn only one thing in our Mishnah, which is that R' Eliezer says: If one had sex with a hermaphrodite, one is liable to be punished with stoning on his account as if one had sex with a male.