Acts 11:2

And when Peter went up to Jerusalem, they of the circumcision disputed with him,

Acts 10:45

And they of the circumcision who were believers, as many as came with Peter, were amazed, because even on the Gentiles the gift of the holy Ghost was poured out.

Acts 10:9

Then the next morning, as they were on their journey, and drew near to the city, Peter went up to the flat roof to pray about the sixth hour:

Acts 15:1

AND certain persons coming down from Judea taught the brethren, That if ye are not circumcised according to the ordinances of Moses, ye cannot be saved.

Acts 15:5

But up rose some of the pharisaical sect, who professed the faith, insisting, That it was necessary to circumcise them, and to enjoin them to observe the law of Moses.

Acts 21:20-23

And they, when they heard it, glorified the Lord, and said unto him, Thou seest, brother, how many myriads there are of Jews who have believed; and they are all zealots for the law:

Galatians 2:12-14

For before certain persons came from James, he did eat with the Gentiles, but when they were come, he withdrew, and separated himself, fearing those of the circumcision.

Treasury of Scripture Knowledge

Summary

And when Peter was come up to Jerusalem, they that were of the circumcision contended with him,

Bible References

They

Acts 10:9
Then the next morning, as they were on their journey, and drew near to the city, Peter went up to the flat roof to pray about the sixth hour:
Acts 15:1
AND certain persons coming down from Judea taught the brethren, That if ye are not circumcised according to the ordinances of Moses, ye cannot be saved.
Acts 21:20
And they, when they heard it, glorified the Lord, and said unto him, Thou seest, brother, how many myriads there are of Jews who have believed; and they are all zealots for the law:
Galatians 2:12
For before certain persons came from James, he did eat with the Gentiles, but when they were come, he withdrew, and separated himself, fearing those of the circumcision.