Welcome to Tractate Bekhorot and the study of firstborns. Even a perfunctory read of the Hebrew Bible will demonstrate that firstborns have special status. In the Book of Genesis, every firstborn son, or bekhor, is the presumed heir to a double portion of his father’s estate and a special blessing. Drama ensues when firstborn status is overturned, such as when Isaac displaces Ishmael, and Jacob displaces Esau. In the Book of Exodus, drama is further heightened when God takes the lives of every firstborn in Egypt — from Pharaoh’s eldest son all the way down to the Egyptians’ cattle — in vengeance for the enslavement of God’s own “firstborn,” the children of Israel (see Exodus 4:23–24). The notion of “firstborn” here extends to an entire nation.
Being firstborn is, without doubt, special. But special how? The answer to that is more complex. Rightly, firstborns belong to God — not overly dissimilar from a tax or tithe owed to authorities. Because of this, firstborns must be either sacrificed or redeemed, which means that something else is given to God in their place.
Hopefully it goes without saying that human firstborns are not sacrificed. Instead, a human child is redeemed with money given to the Temple. Today, Jews continue this practice in the ritual of pidyon haben: the redemption of the firstborn son.
Animals, if they are kosher, are sacrificed in the Temple, and consumed by the priests. In this way, firstborn kosher animals are similar to the sorts of priestly gifts we discussed in Tractate Chullin, which may be one reason Bekhorot follows Chullin in the Talmud.
A donkey, which is not kosher, is also subject to firstborn status. Because it is not kosher, and therefore cannot be sacrificed, a lamb is sacrificed in its place.
Another question we might ask is — and one which occupies this tractate: What exactly is a firstborn? This is also a deceptively simple question. It is helpful to think of firstborn as a status that is conferred under the right circumstances, namely, that the offspring is male, and that it is the first issue of its mother’s womb. This excludes eldest offspring that are female and eldest sons with older sisters. It may also exclude boys born after a miscarriage — depending on the age of that fetus. It also excludes males born by Cesarian, because they do not technically “open the womb.” It excludes males whose species differ from their mother’s species (which is possible in the case of hybrids). Because this is a commandment for Israel only, animals co-owned with gentiles are also not subject to this status.
As always, the Talmud assumes we know these basics and jumps immediately into questions about complex cases. On the first daf of Bekhorot, the concern is a donkey fetus that is male and poised to be a firstborn, but which is, at various points during its gestation, owned by a gentile. Here’s the mishnah:
With regard to one who purchases the fetus of a donkey that belongs to a gentile, and one who sells the fetus of his donkey to a gentile although he is not permitted (to sell a large animal to a gentile), and one who enters into a partnership with a gentile (in ownership of a donkey or its fetus), and one who receives a donkey from a gentile (in order to care for it in exchange for partnership in its offspring), and one who gives his donkey to a gentile in receivership — in all of these cases the donkeys are exempt from firstborn status, as it is stated: “I sanctified to Me all the firstborn in Israel, both man and animal” (Numbers 3:13), indicating that the mitzvah is incumbent upon the Jewish people, but not upon others.
In a nutshell, unless both the donkey and its fetus are owned outright by a Jew, the foal is not a bekhor. If the Jew shares ownership of either the donkey or its offspring, the laws of firstborns do not apply.
As Bekhorot unfolds, it becomes clear that defining firstborn status is partly about biology but even more so about sacred boundaries. By probing the grey areas — from mixed ownership to complex births — the rabbis aren’t merely untangling legal technicalities; they are defining what it means to consecrate the start of life to God in a messy, interconnected world. As you turn the page into this tractate, expect to see how even the most mundane livestock transaction becomes an invitation to notice where the holy meets the everyday.
Read all of Bekhorot 2 on Sefaria.
This piece originally appeared in a My Jewish Learning Daf Yomi email newsletter sent on September 20, 2026. If you are interested in receiving the newsletter, sign up here.
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