In my recent readings in the Bible I found three verses that repeat the truth, throughout eternity and outside of time, Jesus is.

Revelation 1:

⁴This letter is from John to the seven churches in the province of Asia.

Grace and peace to you from the one who is, who always was, and who is still to come; from the sevenfold Spirit before his throne;

⁸ “I am the Alpha and the Omega—the beginning and the end,” says the Lord God. “I am the one who is, who always was, and who is still to come—the Almighty One.”

Joel 1:

²⁵ All glory to him who alone is God, our Savior through Jesus Christ our Lord. All glory, majesty, power, and authority are his before all time, and in the present, and beyond all time! Amen.