King James Bible
"But the unbelieving Jews stirred up the Gentiles, and made their minds evil affected against the brethren."
Those Jews who rejected Paul's gospel message actively incited the non-Jewish population against the new believers. This pattern of opposition from synagogue leaders who felt threatened by the Christian message appears throughout Acts, often resulting in mob violence or expulsion. The agitators poisoned local opinion, turning neutral or curious Gentiles hostile toward the Christian community. The term 'brethren' emphasizes that the targets were fellow believers, highlighting how external opposition sought to isolate and endanger the young church through social prejudice.