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 21:1-4

The Birth of Isaac

1The Lord cvisited Sarah as he had said, and the Lord did to Sarah das he had promised. 2And Sarah econceived and bore Abraham a son in his old age fat the time of which God had spoken to him. 3Abraham called the name of his son who was born to him, whom Sarah bore him, gIsaac.
 Isaac means he laughs
4And Abraham icircumcised his son Isaac when he was eight days old, jas God had commanded him.
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