Holding the mystery of the faith in a pure conscience.
Berean Study Bible (BSB) - 1 Timothy 3:9 >They must hold to the mystery of the faith with a clear conscience.
Textus Receptus (TR) - 1 Timothy 3:9 >ἔχοντας τὸ μυστήριον τῆς πίστεως ἐν καθαρᾷ συνειδήσει.