CIRCUMCISION
Was practiced by the Egyptians. Only elites like the Pharoah were circumsized, by requiring all Jews to be circumsized the Bible is making a statement that all Jews are special and chosen by God.
http://en.wikipedia.org/wiki/Circumcision
The oldest documentary evidence for circumcision comes from ancient Egypt [128] and Greek historian Herodotus states that "the Egyptians and those who have learned it from them are the only people who practise circumcision"
http://encyclopedia2.thefreedictionary.com/Pharaonic+circumcision
Surgical procedure ranging from drawing blood, to removing the clitoris alone, to infibulation or Pharaonic circumcision—removing the external genitals, joining the sides and leaving a small opening. The practice dates to ancient times; usually performed on young girls and in a ritual context, it is purported by its practitioners to guard a girl's virginity and reduce her sexual desires. Because it is usually undertaken in unhygienic conditions, cutting may lead to severe bleeding, infection, debilitating pain, and death; long-term consequences can include an inability to urinate or expel menstrual blood, pain during sexual intercourse, and prolonged childbirth. In some cultures women are reinfibulated after childbirth, while others discourage this practice.
) It is also known as pharaonic circumcision because the 2000 year-old practice can be traced to pharaonic Egypt(30) and pre-Islamic African religious practices.
The Egyptians invented Circumcision!
The jews are in the OT just wannabee Egyptians.