Romans 12:5

And severally (to de kaq ei). A difficult late idiom where the preposition kaq (kata) is treated adverbially with no effect on the nominative case ei like uper egw ( 2 Corinthians 11:23 ). So ei kaq ei ( Mark 14:19 ) and in Modern Greek kaqei as a distributive pronoun. But we have kaq ena in 1 Corinthians 14:31 . The use of the neuter article here to with kaq ei is probably the accusative of general reference, "as to each one."