Final answer:
Paul, in 1 Corinthians 15:33, states that 'Bad company corrupts good character,' indicating the influence of one's company on moral and ethical behavior.
Step-by-step explanation:
Paul is not directly quoted as saying that anything in particular corrupts good manners in the canonical texts of the New Testament. However, in 1 Corinthians 15:33, Paul says, "Do not be misled: 'Bad company corrupts good character.'" This saying, reflecting on moral and ethical behavior, suggests that the company one keeps can have a profound influence on one's manners and actions. Furthermore, the broader context of Paul's teachings and the early Christian community often deal with the contrast between leading a virtuous life versus succumbing to corrupt influences, as seen in various passages from the Acts of the Apostles and the Epistles.