Ephesians 5:3–4: Filthy Talk and the Believer's Mouth
Ephesians 5:3–4 does not measure speech by the setting it happens in but by the identity of the speaker. Filthiness, foolish talking and jesting are named as unfitting for people set apart for God, and thanksgiving is named as the replacement.
Ephesians 4:29: Is Hearing Bad Words a Sin?
Ephesians 4:29 puts the command on the mouth that speaks, not the ear that hears. Yet the verse still shapes how a hearer should treat speech that tears down rather than builds up.
Jude 1:9: Should We Hate or Rebuke Satan?
Jude 1:9 does not command us to hate Satan or to rebuke him in our own authority. Michael, contending directly with the devil, left the rebuke to the Lord and guarded his own mouth.