Where is a clear and convincing verse where Jesus Himself claims to have preexisted "before" His own earthly life (in heaven and/or with the Father)?

Christ said in John 6:62:

"What and if ye shall see the Son of man ascend up where he was before?" (KJV)

Greek scholar A.T. Robertson wrote on this verse:

"Where he was before (hopou ēn to proteron). Neuter articular adjective as adverb (accusative of general reference, at the former time as in Joh 9:8; Gal 3:13). Clear statement of Christ’s pre-existence in his own words as in Joh 3:13; Joh 17:5 (cf. 1:1-18)."

It's a "clear statement" according to this world-renowned Greek scholar. And this is Jesus speaking. Not John, not Paul and not the author of Hebrews.

And it's not just about one verse but what the entire gospel of John teaches about Christ. The themes of Divinity we see from beginning to end. Christ is "the Word [who] was God" (1:1) who came "from heaven," (6:38), "equal with God" (5:18), the eternal "I AM" (8:58) through whom all things came into being (1:3), full of grace and truth (1:14).

Some helpful videos:

'The oneness of the Trinity' : http://bit.ly/2aZKYaZ
'Why Matthew 28:19 must prove the Trinity' : http://bit.ly/2dF5NZj
'A Quick Way To Prove That the Holy Spirit is a Person' : http://bit.ly/2ee0j7T
'Good works are ALWAYS the RESULT of salvation' : http://bit.ly/2e9qOgs
'A Weird Way To Prove The Trinity' : http://bit.ly/2dE0ZFS
'Was Jesus the Commander of the LORD's Army? (Joshua 5:14)' : http://bit.ly/2dIqSoT
'A Quick Case That The Father And Son are One Jehovah' : http://bit.ly/2en42hb

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