Acts 18:18 Meaning: Paul's Vow and Jewish Customs

Three Greek words deserve our attention here. First, the verb behind took his leave is apotassō. It means to separate oneself, to bid farewell, not a casual wave, but a deliberate parting. Paul had grown deeply attached to these brothers and sisters, and leaving them cost him something. Second, keirō (shaved) means to shear or cut short the hair. In the Old Testament, shaving the head was associated with the end of a Nazirite vow (Numbers 6:18). The hair that had been growing during the period of separation was cut off and offered to God. Third, euchē (vow) is the same word for prayer. A vow was a solemn promise made to God, often in response to a crisis or deliverance. Paul had passed through many dangers. This vow was his way of saying thank you, an offering of his very body to the God who had carried him through.

Interpreters have long debated who made this vow. John Wesley and Adam Clarke, among others, argued that it was Aquila, not Paul, pointing to the Greek grammar which can be read either way. They note that Aquila was a Jew who may have taken the Nazirite vow before his conversion and felt bound to complete it. On the other side, John Calvin and Albert Barnes held that the natural reading of the passage attaches the vow to Paul. The Syriac version reads it that way, and Paul himself is the subject throughout the surrounding verses. Both positions have been held by faithful Christians across traditions. What all agree on is that making a vow to God was a practice taken seriously in the early church, and that this act points to the continuity between the Old Covenant and the new faith in Christ.

A common misreading is that Paul's vow contradicts his teaching about grace, as if he were relying on religious works. In fact, Paul never taught that grace and devotion are opposed. He himself wrote, “To the Jews I became as a Jew” (1 Corinthians 9:20). This vow was a cultural expression of his faith, not a requirement for salvation. It shows that gratitude to God can take tangible forms, even for an apostle who preached freedom from the law.

This verse invites you to consider your own promises to God. Maybe you made a vow in a hospital room or during a dark night of the soul, a promise to serve, to give, to change. Paul did not treat his vow lightly. He sailed to Jerusalem to complete it properly. The specific form matters less than the heart behind it. Priscilla and Aquila traveled with Paul; they supported him in his vow. You do not walk your commitments alone. This week, think of one promise you have made to God. Ask yourself: Am I keeping it? Is there a friend I can share it with, someone to help me stay true?