Having a good conscience; that, whereas they speak evil of you, as of evildoers, they may be ashamed that falsely accuse your good conversation in Christ.
Berean Study Bible (BSB) - 1 Peter 3:16 >keeping a clear conscience, so that those who slander you may be put to shame by your good behavior in Christ.
Textus Receptus (TR) - 1 Peter 3:16 >συνείδησιν ἔχοντες ἀγαθήν, ἵνα, ἐν ᾧ καταλαλῶσιν ὑμῶν ὡς κακοποιῶν, καταισχυνθῶσιν οἱ ἐπηρεάζοντες ὑμῶν τὴν ἀγαθὴν ἐν Χριστῷ ἀναστροφήν.