Acts 10:45

And the believers of Jewish descent, who had come with Peter, were amazed [when they saw] that the gift of the Holy Spirit had [now] been poured out on the Gentiles also.

Acts 10:23

So, Peter invited them to stay [for the night]. The next day Peter got up and went with the men, [who were] accompanied by certain [Christian] brothers from Joppa.

Acts 2:38

And Peter replied, "Every one of you must repent [i.e., change your hearts and lives] and be immersed in the name of Jesus Christ [i.e., by His authority] so that your sins will be forgiven [by God] and then you will receive the gift of the Holy Spirit [to live in your hearts].

Acts 2:33

Jesus is [now] exalted at the right side of God, and having received the promised Holy Spirit from His Father, He has poured out what you have seen and heard [here this day].

Acts 11:3

saying, "You went in and ate with non-Jewish people, did you not?"

Acts 11:15-18

"And while I was speaking, [the power of] the Holy Spirit descended on them [i.e., Cornelius' Gentile household] just like [it fell] on us [Jewish apostles] at the beginning [i.e., the day of Pentecost, See chapter 2].

Galatians 2:15

Although we are Jews by natural birth, and not sinful Gentiles [who do not have a relationship with God],

Galatians 3:13-14

Christ bought us back from the curse [caused by our not obeying all the requirements] of the law of Moses; He became a curse for us [by dying on the cross], for it is written [Deut. 21:23], "Every one who hangs on a tree [i.e., a cross] is cursed [i.e., cut off from 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 3:5-8

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 2:13-14

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.

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.