Circumcision in the Old Testament was a relatively simple cut performed with a stone knife, removing the tip of the foreskin that extended beyond the head of the penis. It was far less extensive than what most people picture today. The procedure was rooted in the covenant between God and Abraham described in Genesis 17, where circumcision of every male served as a physical sign of that agreement. The details scattered across several Old Testament passages, combined with what historians know about ancient Near Eastern practices, paint a surprisingly clear picture of how it was actually done.
What Was Physically Removed
The original biblical circumcision, known in Hebrew as milah, involved cutting away only the portion of foreskin that hung past the tip of the glans. This was a relatively minor procedure compared to modern circumcision. A penis circumcised this way still retained most of its foreskin, and the remaining skin would have continued to cover and protect much of the glans as the child grew. The biblical text in Genesis 17:11 describes it simply as circumcising “the flesh of the foreskin.”
This minimal form of circumcision remained standard throughout the entire Old Testament period and was still the practice during the time of Jesus. It wasn’t until around 140 AD, well after the biblical era, that Jewish religious authorities introduced a second, more radical step called periah. This later addition involved stripping back the inner lining of the remaining foreskin from the glans entirely, producing the fully exposed result associated with modern circumcision. That distinction matters: what the Old Testament describes and commands is only the first, more conservative cut.
The Tools: Flint Knives
The Old Testament specifically mentions flint knives as the instrument of circumcision. In Joshua 5:2-3, God commands Joshua to make flint knives and circumcise the Israelites who had been born during the 40 years of wilderness wandering. Zipporah, the wife of Moses, also uses a sharp stone to circumcise her son in the urgent scene described in Exodus 4:25.
Flint was the standard material for sharp cutting tools throughout the ancient Near East long before metalworking became widespread. What’s notable is that flint knives continued to be used for circumcision even after bronze and iron blades were available. Stone tools persisted in religious ceremonies as a kind of sacred conservatism, keeping the ritual tied to its ancient origins even as everyday tools evolved.
Who Performed the Procedure
In the Old Testament, circumcision was not performed by a specialized religious figure. It was carried out by the head of the household, typically the father. When God gave the command, Abraham personally circumcised every male in his household, including his 13-year-old son Ishmael and all of his servants. He later circumcised his son Isaac on the eighth day after birth, as Genesis 21:4 records.
One of the more striking Old Testament accounts involves a woman performing the act. In Exodus 4:24-26, when God threatens Moses’ life for failing to circumcise his son, Moses’ wife Zipporah grabs a flint stone and does it herself. This suggests the procedure was simple enough that no specialized training was required, and the urgency of the covenant obligation overrode any question of who held the knife. The dedicated practitioner known as a mohel, a trained religious circumciser, developed later in Jewish tradition and became the standard figure in the ceremony known as the brit milah.
Why the Eighth Day
Genesis 17:12 specifies that infant boys should be circumcised on the eighth day after birth. This timing was treated as binding religious law. The procedure could only be performed during daylight hours, and while the eighth day was the standard, Jewish law recognized that a sick or weak infant should not be circumcised on schedule. In those cases, the ritual was postponed until seven days after the child was considered healthy enough.
From a modern medical perspective, the eighth day turns out to be well-timed. Newborns have low levels of vitamin K and certain clotting factors during their first days of life. These levels rise and stabilize around the end of the first week, meaning the risk of dangerous bleeding drops significantly by day eight. The ancient Israelites wouldn’t have understood the biochemistry, but they clearly recognized that very early circumcision was risky. Jewish law explicitly states that when a family had a history of bleeding problems, the procedure should be delayed, prioritizing the child’s survival over strict adherence to the timeline.
How It Differed From Egyptian Circumcision
The Israelites were not the only people in the ancient Near East who practiced circumcision. The Egyptians practiced it too, but their technique was distinctly different. Egyptian circumcision involved a dorsal slit, essentially cutting along the top of the foreskin to free the glans without removing the skin entirely. It was an incision, not an amputation. Israelite circumcision, by contrast, fully removed the end of the foreskin.
The age and purpose also differed. Egyptian circumcision was performed on boys between the ages of 6 and 14, most likely as a rite of passage into manhood or a prenuptial ritual. Israelite circumcision happened on the eighth day of life, marking the infant’s entry into the covenant community from essentially the moment life began. These differences in timing, technique, and meaning suggest that while both cultures practiced a form of genital cutting, the Israelite version carried a distinct theological identity rather than being borrowed wholesale from Egypt.
Bleeding and Wound Care
Hemorrhage was the most serious risk, and the ancient Israelites were clearly aware of it. The recognition that some families had hereditary bleeding tendencies led to formal exceptions in religious law allowing circumcision to be postponed. Some historians believe the shift from circumcising older boys (as Abraham did with Ishmael at age 13) to circumcising newborns on the eighth day was partly driven by the desire to complete the covenant obligation before the risk of infant mortality from other causes could intervene.
Ancient wound care in the Near East typically involved washing with wine, which has mild antiseptic properties, and softening the wound with oil. Fig leaves and other plant materials served as dressings. A later practice called metzitzah, documented from the 1500s but believed to be much older, involved the circumciser drawing blood from the wound by mouth after first taking wine or vinegar into his mouth. The intent was to clean the wound and promote blood flow away from the area, though this practice postdates the Old Testament period itself.
The Metaphor: Circumcision of the Heart
As the Old Testament progresses from Genesis through Deuteronomy and the prophets, circumcision takes on a second meaning beyond the physical act. Deuteronomy 10:16 commands the Israelites to “circumcise the foreskin of your heart,” and Leviticus uses the phrase “uncircumcised heart” to describe spiritual stubbornness or resistance to God.
This metaphorical use built on what the physical act already represented. If cutting the foreskin symbolized entering into covenant relationship with God, then an “uncircumcised heart” meant someone whose inner life remained closed off to that relationship despite outward religious observance. The progression in Leviticus moves from outward holiness, expressed through sacrifice and purity laws, toward a demand for inward holiness, a genuine internal transformation. The physical mark on the body was meant to point toward something deeper, and the later prophets increasingly emphasized that the outer sign without the inner reality was meaningless.