You Are God.
Before the mountains were brought forth, Or ever You had formed the earth and the world, even from everlasting to everlasting, You are God. Psalm 90:2 NKJV
To give God the glory of his eternity: Before the mountains were brought forth, before he made the highest part of the dust of the world (as it is expressed, Proverbs 8:26), before the earth fell in travail, or, as we may read it, before thou hadst formed the earth and the world (that is, before the beginning of time) thou hadst a being even from everlasting to everlasting thou art God, an eternal God, whose existence has neither its commencement nor its period with time, nor is measured by the successions and revolutions of it, but who art the same yesterday, to-day, and for ever, without beginning of days, or end of life, or change of time. Note, Against all the grievances that arise from our own mortality, and the mortality of our friends, we may take comfort from God's immortality. We are dying creatures, and all our comforts in the world are dying comforts, but God is an everliving God, and those shall find him so who have him for theirs. - Matthew Henry