Do you forget the person who existed before his incarnation in human form
He had existed in the form of God
Philippians 2:6 (NASB95) — 6 who, although He existed in the form of God, did not regard equality with God a thing to be grasped,
was the exact representation of his nature, the radiance of his glory.
Heb 1:1–3God, after He spoke long ago to the fathers in the prophets in many portions and in many ways, in these last days has spoken to us in His Son, whom He appointed heir of all things, through whom also He made the world. And He is the radiance of His glory and the exact representation of His nature, and upholds all things by the word of His power. When He had made purification of sins, He sat down at the right hand of the Majesty on high,
He created all things
John 1:1–3In the beginning was the Word, and the Word was with God, and the Word was God. He was in the beginning with God. All things came into being through Him, and apart from Him nothing came into being that has come into being.
Col 1:15–17He is the image of the invisible God, the firstborn of all creation. For by Him all things were created, both in the heavens and on earth, visible and invisible, whether thrones or dominions or rulers or authorities—all things have been created through Him and for Him. He is before all things, and in Him all things hold together.
John 1:10He was in the world, and the world was made through Him, and the world did not know Him.
Hebrews 1:10 (NASB 95) — 10 And, “YOU, LORD, IN THE BEGINNING LAID THE FOUNDATION OF THE EARTH, AND THE HEAVENS ARE THE WORKS OF YOUR HANDS;
Hebrews 2:10 (NASB 95) — 10 For it was fitting for Him, for whom are all things, and through whom are all things, in bringing many sons to glory, to perfect the author of their salvation through sufferings.
existed before all things
John 1:1–3 (NASB 95) — 1 In the beginning was the Word, and the Word was with God, and the Word was God. 2 He was in the beginning with God. 3 All things came into being through Him, and apart from Him nothing came into being that has come into being.
Before the world was created, the Word already existed represents the Greek "in (the) beginning was the Word." As the commentaries point out, John obviously intends that his readers see a parallel between the opening words of his Gospel and the opening words of Genesis. "In (the) beginning" refers to the period before creation (creation is not mentioned until verse 3), and so TEV renders this phrase before the world was created see New English Bible (NEB) "when all things began," NEB alternative rendering "The Word was at the creation," and GeCL "In the beginning, before the world was created". John wants his readers to understand that at whatever point the creation began, the Word already existed. (from UBS Translator Handbook Series)
John 8:58Jesus said to them, “Truly, truly, I say to you, before Abraham was born, I am.”
Rev 22:13I am the Alpha and the Omega, the first and the last, the beginning and the end.”
John 17:5Now, Father, glorify Me together with Yourself, with the glory which I had with You before the world was.
Existing with the Father in glory
John 17:5 (NASB 95) — 5 Now, Father, glorify Me together with Yourself, with the glory which I had with You before the world was.
1 John 1:1–2What was from the beginning, what we have heard, what we have seen with our eyes, what we have looked at and touched with our hands, concerning the Word of Life— and the life was manifested, and we have seen and testify and proclaim to you the eternal life, which was with the Father and was manifested to us—