Revelation 1:8

Ἐγώ εἰμι τὸ Α καὶ τὸ Ω, λέγει Κύριος ὁ Θεός, ὁ ὢν καὶ ὁ ἦν καὶ ὁ ἐρχόμενος, ὁ παντοκράτωρ.

“I am the Alpha and the Omega,” says the Lord God, “who is, and who was, and who is to come, the Almighty.”