Romans 4:11-18

He received the sign of circumcision as a seal [confirming] that he had been [considered] righteous because of the faith he had before being circumcised. Thus, he became the [spiritual] father of all people who believe [in God], even though they have not been circumcised, so that they could be considered righteous [by their faith].

Galatians 3:28-29

[In this relationship] there is to be no [distinction between] Jews or Greeks [i.e., Gentiles], slaves or free persons, men or women; for all of you are united into one [body] because of your relationship with 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
He received the sign of circumcision as a seal [confirming] that he had been [considered] righteous because of the faith he had before being circumcised. Thus, he became the [spiritual] father of all people who believe [in God], even though they have not been circumcised, so that they could be considered righteous [by their faith].
Galatians 3:28
[In this relationship] there is to be no [distinction between] Jews or Greeks [i.e., Gentiles], slaves or free persons, men or women; for all of you are united into one [body] because of your relationship with Christ Jesus.