Treasury of Scripture Knowledge

Summary

And they of the circumcision which believed were astonished, as many as came with Peter, because that on the Gentiles also was poured out the gift of the Holy Ghost.

Bible References

The gentiles

Galatians 2:15
Although we are Jews by natural birth, and not sinful Gentiles [who do not have a relationship with God],
Ephesians 2:11
So, you Gentiles by birth should remember what you once were. You are called "Uncircumcision" by those who are called "Circumcision" [i.e., the Jews], (which refers to a physical procedure performed by people).
Ephesians 3:5
which was not told to people of previous generations as it has now been revealed to His [i.e., Christ's] holy apostles and prophets by the Holy Spirit.
Colossians 2:13
And when you were [spiritually] dead because of your sins and your lack of being physically circumcised [Note: This refers to their having been unconverted Gentiles and therefore outside of a relationship with God], God made you alive [again] together with Christ, having forgiven us for all of our sins.