Then Abraham took Ishmael his son and all those born in his house or bought with his money, every male among the men of Abraham's house, and he circumcised the flesh of their foreskins that very day, as God had said to him. Abraham was ninety-nine years old when he was circumcised in the flesh of his foreskin. And Ishmael his son was thirteen years old when he was circumcised in the flesh of his foreskin. That very day Abraham and his son Ishmael were circumcised. And all the men of his house, those born in the house and those bought with money from a foreigner, were circumcised with him.
by: Dale Rood.
What was the purpose of circumcision? Notice it was only the males from among God’s people who were circumcised. It was not a health issue here—though circumcision is done in our day as a health imperative. Nor was it an obligation that was required. Rather it was a sign—an identification mark—for those who came under the covenant of Abraham (Genesis 17:11). It was specifically a mark of identification as a Jew. Under the New Covenant, we have a new sign: the blood of Jesus Christ, and with it the cross. This, now, is the sign for those who are identified as Christians.