Joint-heirs with Christ (
sunklhronomoi Cristou). A late rare double compound, in Philo, an Ephesian inscription of the imperial period (Deissmann,
Light from the Ancient East, p. 92), papyri of the Byzantine period. See 1 John 8:29 for this idea expanded. Paul is fond of compounds of
sun, three in this verse (
sunklhronomoi, sunpascwmen, sundoxasqwmen). The last (first aorist passive subjunctive of
sundoxazw with
ina (purpose), late and rare, here only in N.T.