Q&A: The Percentage of Firstborns in the Tribe of Levi
The Percentage of Firstborns in the Tribe of Levi
Question
Hello Rabbi Michael,
Regarding the portion of Bamidbar, I noticed that the percentage of firstborns in the tribe of Levi (1 out of 73) is quite low. This calculation follows from the fact that when the Levites are counted, the result should come out to 22,300, but the verse for some reason says 22,000 (Numbers 3:39). And the commentators mention tractate Bekhorot, where they explain that the 300 were firstborns of the tribe of Levi, and therefore they were not mentioned in the count for the purpose of redeeming the firstborns of Israel. On the other hand, this interpretation yields an illogically low percentage of firstborns, especially since it differs significantly from the percentage of firstborns in the other tribes (1 out of 27). So I want to raise two possibilities: perhaps this interpretation is not necessarily correct, and it could be that there were more firstborns, but then the disappearance of the 300 Levites would need to be explained some other way (the question is how). Another possibility is that the percentage of firstborns really was extremely low, because of exceptionally high birthrates in the tribe of Levi. The problem with the second possibility is that I read regarding the tribe of Levi that the decree against the newborns was not imposed on them (throwing them into the Nile), and therefore the blessing “the more they were oppressed, the more they multiplied and spread” did not apply to them. That is also the reason the tribe of Levi is the smallest tribe (22,000 versus an average of about 55,000 per tribe among the other tribes — meaning men aged twenty and up only, of course). So logic would suggest that the percentage of firstborns in the tribe of Levi should be higher than the percentage of firstborns in the other tribes of Israel, but the numbers show the opposite (1 out of 73 in the tribe of Levi versus 1 out of 27 in the other tribes). I would be glad to hear your opinion on the matter.
Answer
As for the firstborns, I don’t know. The whole issue of the firstborns in Bamidbar is full of problems. I seem to recall an article by Eliyahu Beller about this in the journal Higgayon. I don’t remember what he argued there.
Discussion on Answer
I saw on ChatGPT an answer for the low percentage of firstborns:
If you take the 22,273 firstborns as “all the firstborns who were alive at that moment,” you get a ratio of about 1:60-70 relative to the total number of males, which would require something on the order of dozens of children per mother — something unreasonable even under conditions of maximum fertility in the ancient world.
Where is the mistake in the calculation?
The census is not counting “all firstborns from all time”
— several commentators (already from the early 19th century, and today in academic scholarship as well; see for example Cambridge Bible or a discussion on Hermeneutics.SE) suggest that the command to count the firstborns — “Sanctify to Me every firstborn” — applied only to firstborns born from that night onward (the night of the Exodus from Egypt). In other words: only firstborns up to about a year and a half old were counted, not those who were already 10–40 years old at the time of the Exodus.
Biblical Hermeneutics Stack Exchange
https://hermeneutics.stackexchange.com/questions/28496/does-numbers-343-refer-to-all-the-firstborn-sons-of-israel?utm_source=chatgpt.com
Bible Hub
https://biblehub.com/commentaries/numbers/3-43.htm?utm_source=chatgpt.com
Once you limit it to ages 0–1, the numbers become reasonable:
The Israelite population (males + females) in the wilderness is estimated at about 2 million.
A high natural birthrate in pre-industrial periods is 35–45 births per 1,000 people per year.
22,273 male firstborns = about 44,500 first births (male + female) in a year → 22 births per 1,000 people — a completely reasonable number.
So there is no need at all for “60 children per mother”; we are simply talking about ordinary annual births.
The implication for Levi
If we count only the firstborns born in the last year, it becomes clear why their number (22,273) almost overlaps with the number of Levites (22,000): the Holy One, blessed be He, “replaced” that year’s firstborns with the Levites.
The 300 “missing” Levites (firstborn Levites) do not disappear — they are disqualified from serving as substitutes, and therefore Moses skips over them (Rashi on Numbers 3:39).
And what about the older firstborns?
They indeed were holy — but had already been redeemed for five shekels immediately after the command was given (Exodus 13; Rashi there).
I’m remembering this 9 years later, but the ratio among the people of Israel is not 1/27. That’s a complete mistake. To get 1/27 you have to calculate as though there were 22,000 firstborns out of 600,000, but that’s not the reality. The 600,000 are those aged 20 and up, while the firstborns were counted from one month old. The Israelites numbered at least 1,600,000 people at that time, and if you calculate it that way it comes out that there is no difference between the ratio of firstborns in the tribe of Levi and the ratio of firstborns in the other tribes.