Contradiction with Matthew 5:36
This verse advises not to swear by one's head, suggesting a departure from making vows or oaths, which contrasts with the vow mentioned in Acts 18:18.
Matthew 5:36: Neither shalt thou swear by thy head, because thou canst not make one hair white or black.
Contradiction with 1 Corinthians 7:18
This verse suggests not to change one’s physical state for religious reasons, conflicting with the act of shaving the head due to a vow in Acts 18:18.
1 Corinthians 7:18: Is any man called being circumcised? let him not become uncircumcised. Is any called in uncircumcision? let him not be circumcised.
Contradiction with Galatians 5:2
Paul’s opposition to physical signs like circumcision for showing faith contrasts with the physical act of shaving due to a vow in Acts 18:18.
Galatians 5:2: Behold, I Paul say unto you, that if ye be circumcised, Christ shall profit you nothing.
Contradiction with Colossians 2:16-17
This passage suggests that old religious practices are shadows of things to come and not essentially binding, differing from the observance of vows in Acts 18:18.
Colossians 2:16-17: Let no man therefore judge you in meat, or in drink, or in respect of an holyday, or of the new moon, or of the sabbath [days]: [in meat...: or, for eating and drinking] [respect: or, part]