Romans 4:11-18

And he received the sign of circumcision, as a seal of the righteousness of the faith which he had when uncircumcised: that he might be the father of all those who believe, though uncircumcised; that to them also the righteousness might be imputed:

Galatians 3:28-29

There is no more Jew or Gentile, there is no more slave or freeman, there is no more male or female: but ye are all one in Christ Jesus.

Treasury of Scripture Knowledge

Summary

As for me, behold, my covenant is with thee, and thou shalt be a father of many nations.

Bible References

A father

Romans 4:11
And he received the sign of circumcision, as a seal of the righteousness of the faith which he had when uncircumcised: that he might be the father of all those who believe, though uncircumcised; that to them also the righteousness might be imputed:
Galatians 3:28
There is no more Jew or Gentile, there is no more slave or freeman, there is no more male or female: but ye are all one in Christ Jesus.