Mishnah Temurah 5:1: How may one act cleverly [to circumvent the law] regarding a firstborn [animal]? [One owns] a pregnant animal about to give birth for the first time, and says, "Whatever is inside of this [animal], if it is a male, [it is dedicated] as an Olah [offering that is entirely burnt]" - if it gives birth to a male, it [the newborn animal] is offered as an Olah. [If he says,] "[If] it is a female, [it is dedicated] as a Shelamim [an offering whose various parts are consumed by its owners, the Kohanim and the fire on the altar]" - if it gives birth to a female, it is offered as a Shelamim. [If he says,] "[If] it is a male, [it is dedicated] as an Olah; if it is a female, [it is dedicated] as a Shelamim" - if it gives birth to a male and a female, the male is an Olah and the female a Shelamim.

כיצד מערימים על הבכור. מבכרת שהיתה מעוברת. אומר מה שבמעיה של זו. אם זכר. עולה. ילדה זכר יקרב עולה. ואם נקבה. זבחי שלמים. ילדה נקבה תקרב שלמים. אם זכר עולה. אם נקבה זבחי שלמים ילדה זכר ונקבה. הזכר יקרב עולה והנקבה תקרב שלמים:

Mishnah Temurah 5:2: If an animal gives birth to two males, one is offered as an Olah and the second is sold to one who needs to offer an Olah, and its payment is not holy. If it gave birth to two females, one is offered as a Shelamim and the second is sold to one who needs to offer a Shelamim, and the money is not holy. If it gave birth to a tumtum [person (or animal) with recessed sexual organs whose gender is therefore impossible to determine, presently, by external examination. It is halachically uncertain whether such is male or female], or an androginos [person (or animal) with both male and female sexual organs. It is halachically uncertain whether such is male, female or, perhaps, has a uniquely defined halachic gender], Rabban Shimon ben Gamliel says: holiness does not take effect regarding them.

ילדה שני זכרים אחד מהן יקרב עולה והשני ימכר לחייבי עולה. ודמיו חולין. ילדה שתי נקבות. אחת מהן תקרב שלמים. והשניה תמכר. לחייבי שלמים. ודמיה חולין. ילדה טומטום ואנדרוגינוס. רבן שמעון בן גמליאל אומר. אין קדושה חלה עליהן: