Shalom, I'm Enoch.

BOTTOM LINE: A vasectomy, as a permanent surgical sterilization procedure in males, is considered a violation of the biblical mitzvah to "be fruitful and multiply," which is consistently interpreted in Jewish tradition as a divine commandment rather than merely a blessing.

The Torah commands humanity from the earliest chapters to "be fruitful and multiply" (Genesis 1:28, Genesis 9:7). This instruction is not merely a blessing but a foundational mitzvah (commandment) for humankind. The rabbinic tradition has consistently affirmed this as an active obligation upon men, while women are not typically held to the same direct commandment, though they share in the blessing and purpose of procreation. The Mishna and Talmud directly address the obligation, with specific discussions in Tractate Yevamot detailing how one fulfills this mitzvah, typically requiring at least a son and a daughter according to Beit Hillel, or two sons according to Beit Shammai (Mishnah Yevamot 6:6, Talmud Bavli Yevamot 61b). The core understanding is that deliberate actions to prevent procreation are contrary to this fundamental divine instruction. A vasectomy, by rendering a man sterile and thus intentionally preventing his participation in procreation, directly contravenes this established commandment, placing it outside the bounds of halakha (Jewish law).

CITATIONS

1. Genesis 1:28 (Scripture — verified in library)
2. Genesis 9:7 (Scripture — verified in library)
3. Radak on Genesis 1:28: States that "our sages in Yevamot 65 and in Bereshit Rabbah 8,12 understand this verse as a commandment to the human race to reproduce."
4. Radak on Genesis 9:7: Emphasizes that this repetition is "not only a blessing but a positive commandment."
5. Talmud Bavli Yevamot 61b, segment 15: "A man may not neglect the mitzva to be fruitful and multiply unless he already has children. Beit Shammai say: One fulfills this mitzva with two males, and Beit Hillel say: A male and a female, as it is stated: “Male and female He created them” (Genesis 5:2)."
6. Talmud Bavli Yevamot 65b, segment 3: "Men are commanded to be fruitful and multiply-- but not women."
7. Talmud Bavli Sanhedrin 57a, segment 6: Discusses the prohibition of castration for Noahides, explicitly linking it to the command "And you be fruitful and multiply," indicating that "nothing may be done to prevent reproduction."

COMMON MISUNDERSTANDINGS

• Some might think that since Genesis 1:28 mentions "blessed them," procreation is merely a blessing, not a binding command. → This misunderstanding is directly addressed by Radak on Genesis 1:28 and 9:7, which explicitly states that while it is a blessing, the sages understand it as a binding commandment, especially in Genesis 9:7, where it is presented as a renewed positive commandment after the flood.
• Others believe that once one has children, the obligation to be fruitful and multiply ceases, making subsequent sterilization permissible. → While the halakha provides criteria for fulfilling the mitzvah (e.g., two children of a specific gender combination as per Beit Hillel or Beit Shammai in Talmud Bavli Yevamot 61b), these criteria define the minimum fulfillment, not a termination of the general principle to not prevent reproduction. Furthermore, the prohibition against intentional castration or rendering oneself sterile is distinct and generally upheld regardless of prior progeny (Talmud Bavli Sanhedrin 57a).

The command to "be fruitful and multiply" is a foundational mitzvah, and intentional sterilization through procedures like a vasectomy is understood in Torah-observant faith as a violation of this divine imperative, as it directly acts to prevent the very procreation that God has commanded.

REPROOF'S POSITION The Torah clearly mandates procreation as a divine commandment for men, and any intentional, permanent action that prevents this, such as a vasectomy, is considered a violation of that mitzvah.

• But does not the New Covenant release believers from such physical commandments? → No, Yeshua affirmed the Torah, stating He came not to abolish but to fulfill it (Matthew 5:17-19); the New Covenant involves writing the Torah upon the heart, not its abrogation (Jeremiah 31:31-33).
• Isn't this just an Old Testament law that doesn't apply to modern believers? → The instruction to "be fruitful and multiply" is a fundamental creation ordinance, reiterated to Noah, indicating its universal and enduring nature, not merely a temporary Mosaic law.

Therefore, the practice of vasectomy is contrary to the clear biblical command to be fruitful and multiply, a mitzvah that remains binding for followers of Yeshua.