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John 6:38-40
For I have come down from heaven, not to do my own will, but the will of him who sent me; and this is the will of him who sent me, that I should lose nothing of all that he has given me, but raise it up at the last day. For this is the will of my Father, that everyone who sees the Son and believes in him should have eternal life; and I will raise him up at the last day.
The first verse suggests that Jesus came down from Heaven. This seems to contradict the belief that he first existed as a man when he was born into this world. For if Jesus was first conceived through Mary and had no pre-existence, how could he come down from Heaven. We (Man) come into existence when we are born into this world, but would it be correct to say that we came down from Heaven? If a verse said that we came down from Heaven, would you think that we pre-existed in Heaven?
John 1:15
15 John testifies concerning him. He cries out, saying, “This was he of whom I said, ‘He who comes after me has surpassed me because he was before me.’ “
John the Baptist was 6 months older than Jesus Christ. So it is physically impossible for Christ to be before him. Surely this verse shows preexistence, at least before John the Baptist.
Jude 1:25
to the only God our Savior be glory, majesty, power and authority, through Jesus Christ our Lord, before all ages, now and forevermore! Amen.
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Colossians 1:17
He is before all things, and in him all things hold together.
These 2 verses you just read blatantly say that he is before all things.
John 1:3
Through him all things were made; without him nothing was made that has been made.
So there is nothing that was made that didn’t involve Jesus/The Word being there. This verse alone answers your question because the universe, angels and men were made and Jesus was present when they were created.
John 8:58
“I tell you the truth,” Jesus answered, “before Abraham was born, I am!”
Jesus claimed to exist before Abraham. The words I am mean I exist. So Jesus existed before Abraham.
Revelation 22:16
“I, Jesus, have sent my angel to give you this testimony for the churches. I am the Root and the Offspring of David, and the bright Morning Star.”
Here we see that Jesus is the offspring of David, yet he is also the root of David, which at appears to show existence before King David.
Luke 10:18
He replied, “I saw Satan fall like lightning from heaven.
Compare Luke 10:18 with Revelation 12:1-10 and it appears that Satan and his angels fell to the earth before the birth of Christ as a man. Now we know that Jesus was the Word and was with God in the beginning.