1 Corinthians 9:20, Unto the Jews I came as a Jew
The Apostle Paul has the heart to win souls for Christ. As such, to whomever, God will bring his way, He would try his utmost to reach out. For his own Jewish countrymen, he sought to reach out to them, In fact, in every new city he visits, he would begin ministering first to his own people. There in the synagogue, he was received for he was a famous rabbi before his conversion, having studied under the famous teacher Gamaliel.