The Council at Jerusalem

1 Certain people came down from Judea to Antioch and were teaching the believers: “Unless you are circumcised, according to the custom taught by Moses, you cannot be saved.”

Read Acts 15:1 Using Other Translations

And certain men which came down from Judaea taught the brethren, and said, Except ye be circumcised after the manner of Moses, ye cannot be saved.
But some men came down from Judea and were teaching the brothers, "Unless you are circumcised according to the custom of Moses, you cannot be saved."
While Paul and Barnabas were at Antioch of Syria, some men from Judea arrived and began to teach the believers : “Unless you are circumcised as required by the law of Moses, you cannot be saved.”