Zipporah's Flint Knife

Then Zipporah took a flint and cut off her son's foreskin, and touched his legs with it. She said, "You are truly a bridegroom of blood to me!"  And when He let him alone, she added, "A bridegroom of blood because of the circumcision."  Exodus 4:25, 26 (The Jewish Study Bible)

Badarian-Naqada flint knife with ivory handle (3200 B.C.)

Moses had two wives, following the pattern of his ruler-priest father and forefathers. One wife was Cushite (Numbers 12). This wife would have been his half-sister. Her designation as "Cushite" means that Moses' father married a Cushite. The mother of Korah and Moses' half-sister wife was Ishar, a descendent of Seir.  Moses' mother was Jochebed. Korah's mother was Ishar, but the two men had the same father, Amram. Amram had two wives according to the pattern of ruler-priests among his people.

Moses' cousin wife was Zipporah, the daughter of Jethro, a Midianite priest. Moses met her at a well where she was drawing water for her father’s livestock. Priests maintained shrines near wells, natural springs or along the banks of rivers. As a priest's daughter, Zipporah would have been familiar with animal sacrifices and with circumcision, but she would not have performed these nor would she have been present when they were performed. This is why her circumcision of her first-born son is remarkable. It also suggests that Moses was not qualified to circumcise his son. Apparently, Amram's first-born sons were Korah and Aaron, both priests. They would have been qualified to do it, but were not present when the necesity arose.

Flint knives and circumcision are also mentioned in Joshua. At that time the Lord said to Joshua, "Make flint knives and circumcise the people of Israel again the second time." So Joshua made flint knives, and circumcised the people of Israel at Gibeath ha-aralot. And this is the reason why Joshua circumcised them: all the males of lthe people who came out of Egypt, all the men of war, had died on the way in the wilderness after thy had come out of Egypt. Though all the people who came out had been circumcised, yet all the people that were born on the way in the wilderness after they had come out of Egypt had not been circumcised. Joshua 5:2-5

4000 B.C. Badarian flint

The necessity to circumcise those born in the wilderness required the production of flint knives. Flint was the first mineral used to make tools.  Flint or obsidian have edges sharper than modern surgical steel. Flint workshops have been found throughout the Negev, suggesting that even after the production of iron tools, the flint knife was prefered for circumcision in honor of an ancient tradition among Abraham's Horite people.
The largest flint knives, dating to about 3000 B.C., were produced in Egypt and were found at Hierakonpolis, a center for the worship of Horus, who was called the "son of God." Votive offerings at the temple of Horus were gigantic, up to ten times larger than the normal maceheads and stone bowls found elsewhere. These objects are found only at Hierakonpolis, suggesting that the 4000 B.C. temple there was extremely prestigious.

Hierakonpolis is the site of the most ancient temple and city in Egypt. By 3500 BC, it was a city of many neighborhoods, industries and privates homes, extending over 3 miles along the Nile. Masks, pottery, graves and tombs with reliefs and paintings have been found there. Horite priests placed invocations to Horus at the summit as the sun came over the eastern horizon.  At Hierakonpolis archeaologists have discovered a 3000 B.C. life-sized statue of a Horite priest and a 2300 B.C. golden hawk head of Horus.