Romans 4:11

and he received circumcision as a sign, a seal of the faith-righteousness which he had while he was in uncircumcision; in order that he might be the father of all who believe, even though they are uncircumcised; so that righteousness might be imputed to them.

Acts 7:8

"Then he gave him a covenant of circumcision, and under this covenant he became the father of Isaac, whom he circumcised on the eighth day, and Isaac became the father of Jacob, and Jacob became the father of the twelve Patriarchs.

Treasury of Scripture Knowledge

Summary

And ye shall circumcise the flesh of your foreskin; and it shall be a token of the covenant betwixt me and you.

Bible References

A token

Acts 7:8
"Then he gave him a covenant of circumcision, and under this covenant he became the father of Isaac, whom he circumcised on the eighth day, and Isaac became the father of Jacob, and Jacob became the father of the twelve Patriarchs.
Romans 4:11
and he received circumcision as a sign, a seal of the faith-righteousness which he had while he was in uncircumcision; in order that he might be the father of all who believe, even though they are uncircumcised; so that righteousness might be imputed to them.
Acts 7:8
"Then he gave him a covenant of circumcision, and under this covenant he became the father of Isaac, whom he circumcised on the eighth day, and Isaac became the father of Jacob, and Jacob became the father of the twelve Patriarchs.
Romans 4:11
and he received circumcision as a sign, a seal of the faith-righteousness which he had while he was in uncircumcision; in order that he might be the father of all who believe, even though they are uncircumcised; so that righteousness might be imputed to them.