Bede : When Silas and Timothy came from Macedonia, and so forth. Who had his hair cut in Cenchreae for he had a vow. Cenchreae is a port of Corinth, where he cut his hair due to a vow because, according to the law of Moses, those who vowed themselves to God were commanded to let their hair grow as long as they wished to be Nazirites, and afterward to cut it and offer it to the fire. Therefore, Paul did this, not indeed forgetting what he had decided with the other apostles in Jerusalem about the abolition of the law, but lest those who had believed from among the Jews be scandalized, he pretended to be a Jew in order to win the Jews. Some manuscripts have in the plural number "They shaved their head, and had a vow," meaning Priscilla and Aquila. But the distinguished doctors of the Church Jerome and Augustine, each in their letters, put it in the singular number and interpret it concerning Paul. Jerome writes thus: "Bidding farewell to the brothers, he sailed to Syria, and with him Priscilla and Aquila, and he had his head shaved in Cenchreae for he had a vow." — Commentary on Acts Bede : Bidding farewell to the brothers, he traveled to Syria, and with him Priscilla and Aquila, who had his head shaved in Cenchrea, etc. It seems unclear whether Paul or Aquila had their head shaved in Cenchrea; but Jerome the presbyter clearly, as we explained more fully in the previous book, understands this as said of Paul. For after he gave this statement in his letter to Augustine, he immediately added and said: "Even if there he was compelled to circumcise Timothy out of fear of the Jews, why did he grow his hair out as a vow, and later cut it in Cenchrea according to the law?" If we wish to follow his meaning in this place, we never read anywhere that Aquila was shaved. If we say that Aquila was shaved in this place, there remains at the end of this booklet a place where we also read that Paul was shaved, or shaved off. However, those who say that Aquila and his wife Priscilla were shaved are mistaken due to a textual error. For in the Greek, it is clearly written κειράμενος, that is, shaved, in the singular number, and he had a vow, not they had, whether this is understood of Paul or Aquila. — Retractions on Acts Didymus the Blind : After his resurrection the Savior said to his disciples, "Go and make disciples of all nations." They to whom the command had been given knew that "God wants all people to be saved and to attain knowledge of the truth." Since the human race had been divided into two religious groups, Jews and pagans, a division of the heralds of the gospel was also made so that some were assigned to teach the Jews, while others to be apostles of the nations. But since all the teachers had the single aim of leading all to the knowledge of the one God and to the teaching of the gospel, Paul, though an apostle of the nations, if he happened to be able to benefit the Jews would, without a doubt, become a Jew to the Jews so that they might not be estranged from him as if he had departed from the law, although he had already crossed over and beyond the Jewish shadow. In this way, therefore, according to the customs of his homeland, he shaved his head at Cenchrea, since he was under a vow according to the prescription of the old law. — CATENA ON THE ACTS OF THE APOSTLES 18.18 Jerome : Granted that there he did what he did not wish to do, through the compelled fear of the Jews: why did he let his hair grow in consequence of a vow and afterward cut it at Cenchrea in obedience to the law. Because the Nazarites who vowed themselves to God were accustomed to do this according to the commands of Moses? — LETTER 75 John Chrysostom : See how the Law was breaking up; see how they were bound by conscience. This, namely, was a Jewish custom, to shear their heads agreeably with a vow. But then there ought to be also a sacrifice, which was not the case here. "Having yet tarried:" after the beating of Sosthenes. For it was necessary that he should yet tarry, and comfort them concerning these things. "He sailed for Syria." Why does he desire again to come to Syria? It was there that "the disciples were ordered to be called Christians": there, that he had been "commended to the grace of God": there, that he had effected such things concerning the doctrine. — Homily on Acts 40 Oecumenius : Paul again went down to Syria, and with him Priscilla and Aquila, having had his head shaved; for to have the head shaved according to a vow was Jewish. And a sacrifice was also to be offered, which, however, did not take place after Sosthenes had been blinded; for the law was already being set aside, since they were restrained by conscience. [DIDYMUS] — Commentary on Acts