G2029–ἐποπτεύω–epopteuō

having your conversation honest among the Gentiles, that [ergänzt: as to that] in which they speak against you as evildoers, they may through [ergänzt: your] good works, [ergänzt: themselves] witnessing [ergänzt: them], glorify God in [ergänzt: the] day of visitation.

ἐποπτεύοντες epopteuontes “having witnessed”

having witnessed your pure conversation [ergänzt: carried out] in fear;

ἐποπτεύσαντες epopteusantes “having witnessed”