Strong's G3801 — ὅ ὤν καί ὅ ἦν καί ὅ ερχόμενος (Name Person)
ho on kai ho en kai ho erchomenos (hoh' own' kai' hoh' ayn` kai' hoh' er-khom'-en-os) n/p.
1. the one being and the one that was and the one coming, i.e. the Eternal, as a divine epithet of Christ
[a phrase combining G3588 with the present participle and imperfect of G1510 and the present participle of G2064 by means of G2532]
KJV: which art (is, was), and (which) wast (is, was), and art (is) to come (shalt be) 
Root(s): G1510, G2532, G3588, G2064 
Hebrew root: καί