Genesis 17:12

12He who is aeight days old among you shall be circumcised. Every male throughout your generations, whether born in your house or bbought with your money from any foreigner who is not of your offspring,

Genesis 21:3-4

3Abraham called the name of his son who was born to him, whom Sarah bore him, cIsaac.
 Isaac means he laughs
4And Abraham ecircumcised his son Isaac when he was eight days old, fas God had commanded him.

Leviticus 12:3

3And on the geighth day the flesh of his foreskin shall be circumcised.

Luke 2:21

21And hat the end of eight days, when he was circumcised, ihe was called Jesus, the name given by the angel before he was conceived in the womb.

Acts 7:8

8And jhe gave him the covenant of circumcision. And kso Abraham became the father of Isaac, and lcircumcised him on the eighth day, and mIsaac became the father of Jacob, and nJacob of the twelve patriarchs.

Philippians 3:5

5 ocircumcised on the eighth day, pof the people of Israel, qof the tribe of Benjamin, ra Hebrew of Hebrews; as to the law, sa Pharisee;
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