G5432–φρουρέω–phroureō

In Damascus the ethnarch of Aretas the king was watching the city of the Damascenes, wishing to seize me,

ἐφρούρει ephrourei “was guarding”

And before the coming of the faith, under law we were being kept, shut up to the faith about to be revealed,

ἐφρουρούμεθα ephrouroumetha “we were held in custody”

and the peace of God, that is surpassing all understanding, shall guard your hearts and your thoughts in Christ Jesus.

φρουρήσει phrourēsei “will guard”

who, in the power of God are being guarded, through faith, unto salvation, ready to be revealed in the last time,

φρουρουμένους phrouroumenous “[are] being guarded”