a phrase combining ὁ with the present participle and imperfect of εἰμί and the present participle of ἔρχομαι by means of καί; the one being and the one that was and the one coming, i.e. the Eternal, as a divine epithet of Christ:--which art (is, was), and (which) wast (is, was), and art (is) to come (shalt be).