Acts 14:1-3

Now in Iconium Paul and Barnabas went into the Jewish synagogue together and spoke in such a way [with such power and boldness] that a large number of Jews as well as Greeks believed [and confidently accepted Jesus as Savior]; but the unbelieving Jews [who rejected Jesus as Messiah] stirred up and embittered the minds of the Gentiles against the believers. So Paul and Barnabas stayed for a long time, speaking boldly and confidently for the Lord, who continued to testify to the word of His grace, granting that signs and wonders (attesting miracles) be done by them.