John Calvin on Acts 11:27

27. Luke commendeth in this place the faith of the men of Antioch by the fruit, because they endeavored to relieve the poverty of that church, from whence they received the gospel, with their abundance; and that did they unrequested. Such earnest care for the brethren doth sufficiently declare how seriously they worshipped Christ, the head of all. Luke doth signify that the fame of that church was spread abroad, when he saith that there came excellent men thither from Jerusalem. But forasmuch as the word prophet is taken divers ways in the New Testament as we may learn by the former Epistle to the Corinthians, those are called prophets in this place who were endued with the gift of prophesying, as the four daughters of Philip shall have the same title given them hereafter. And forasmuch as the foretelling of the famine is attributed to Agabus alone, we may hereby gather that this was granted to every one by a certain measure to know things to come.