The preexistence of Jesus is manifest in the name with which Jesus appears before the apostle John in the book of the Revelation of the things that will happen in the last time.
I am Alpha and Omega, the beginning and the ending, saith the Lord, which is, and which was, and which is to come, the Almighty. Revelation 1:8
Name that is mentioned on four different occasions throughout the book,
Saying, I am Alpha and Omega, the first and the last: and, What thou seest, write in a book, and send it unto the seven churches which are in Asia; unto Ephesus, and unto Smyrna, and unto Pergamum, and unto Thyatira, and unto Sardis, and unto Philadelphia, and unto Laodicea. Revelation 1:11
And he said unto me, It is done. I am Alpha and Omega, the beginning and the end. I will give unto him that is athirst of the fountain of the water of life freely. Revelation 21:6
I am Alpha and Omega, the beginning and the end, the first and the last. Revelation 22:13
Notice also that the name, I am Alpha and Omega, ends up establishing a relationship with the name with which Jehovah God manifested himself to Moses. Being Alpha and Omega is equivalent to being, which is, and which was, and which is to come, thus establishing parity with the, I am that I am, of Exodus.
The pre-existence of Jesus is certified in all the apostolic and prophetic writings. Jesus declared before the scribes and Pharisees that Abraham saw his day,
Your father Abraham rejoiced to see my day: and he saw it, and was glad. 57Then said the Jews unto him, Thou art not yet fifty years old, and hast thou seen Abraham? 58Jesus said unto them, Verily, verily, I say unto you, Before Abraham was, I am. John 8:56-58
In the description of the creation and formation of man, of the Genesis narrative, the pre-existence of Jesus is clear in God’s decision to form him in his image,
And God said, Let us make man in our image, after our likeness: and let them have dominion over the fish of the sea, and over the fowl of the air, and over the cattle, and over all the earth, and over every creeping thing that creepeth upon the earth. Genesis 1:26
What image and what likeness? If God is Spirit,
God is a Spirit: and they that worship him must worship him in spirit and in truth. John 4:24
The terms image and likeness do not refer to attributes. They are qualities of appearance.
The apostle Paul expose that the image that was taken to form the man was that of Jesus.
For whom he did foreknow, he also did predestinate to be conformed to the image of his Son, that he might be the firstborn among many brethren. Romans 8:29
Who is the image of the invisible God, the firstborn of every creature: Colossians 1:15
Now we can understand a doctrinal aspect of the spiritual and genetic deformation that sin provokes; also, why the recovery of the lost image and likeness is only possible in Christ Jesus, and how we are made alive in him.
And have put on the new man, which is renewed in knowledge after the image of him that created him: Colossians 3:10
The pre-existence of Jesus is certified also in book of Psalms. In Psalm 110, verse 1, David exposes that Jehovah God (LORD) dialogue with Jesus (Lord) in the eternity,
The LORD said unto my Lord, Sit thou at my right hand, until I make thine enemies thy footstool. Psalm 110:1
Jesus also referred to this same text, and used it to show how David calls the Christ, Lord, even though he was not born yet. Jesus again shows the preexistence certification established by David.
While the Pharisees were gathered together, Jesus asked them, 42Saying, What think ye of Christ? whose son is he? They say unto him, The Son of David. 43He saith unto them, How then doth David in spirit call him Lord, saying, 44The LORD said unto my Lord, Sit thou on my right hand, till I make thine enemies thy footstool? 45If David then call him Lord, how is he his son? Matthew 22:41-45