The old covenant vow, the Nazarite vow, is no longer of any use in the new covenant,
Acts 21:23-26 ......... "But as for the Gentiles who have believed, we have sent a letter with our judgment that they should abstain from what has been sacrificed to idols, and from blood, and from what has been strangled, and from sexual immorality.”
As such, the Apostle Paul's admonition to the church in Corinth, under the new covenant, is true for the body of Christ in this age....... long hair dishonors a man 1 Corinthians 11:14.