Then David sent messengers to Saul’s son Ishbaal, saying, “Give me my wife Michal, to whom I became engaged at the price of one hundred foreskins of the Philistines.”
If an alien who resides with you wants to celebrate the Passover to the Lord, all his males shall be circumcised; then he may draw near to celebrate it; he shall be regarded as a native of the land. But no uncircumcised person shall eat of it;
Then he gave him the covenant of circumcision. And so Abraham became the father of Isaac and circumcised him on the eighth day, and Isaac did likewise to Jacob and Jacob to the twelve patriarchs.
He received the sign of circumcision as a seal of the righteousness that he had by faith while he was still uncircumcised. The purpose was to make him the ancestor of all who believe without being circumcised and who thus have righteousness reckoned to them,