Acts 16:1-5 NIV
Paul came to Derbe and then to Lystra, where a disciple named Timothy lived, whose mother was Jewish and a believer but whose father was a Greek. The believers at Lystra and Iconium spoke well of him. Paul wanted to take him along on the journey, so he circumcised him because of the Jews who lived in that area, for they all knew that his father was a Greek. As they traveled from town to town, they delivered the decisions reached by the apostles and elders in Jerusalem for the people to obey. So the churches were strengthened in the faith and grew daily in numbers.
NIV: New International Version