Albert Barnes on Acts 11:1

And the apostles and brethren. The Christians who were in Judea.

Heard, etc. So extraordinary an occurrence as that at Caesarea, the descent of the Holy Spirit on the Gentiles, and their reception into the church, would excite attention, and be likely to produce much sensibility in regard to the conduct of Peter and those with him. It was so contrary to all the ideas of the Jews, that it is not to be wondered at that it led to contention.