Jesus is "the only begotten God who is in the bosom of the Father" (Jn 1:18) who said to the Father, "'You loved Me before the foundation of the world'" (17:24). Also, it was "'the glory which I had with You before the world was'" (:5). This is before Creation because "He is before all things" (Col 1:7). "In the beginning was the Word, and the Word was with God" (Jn 1:1). Jesus said, "'I am the Alpha and the Omega, the beginning and the end'" (Rev 21:6) and "'the first and the last'" (22:13). Melchizedik personifies Christ as "having neither beginning of days nor end of life, but made like the Son of God" (Heb 7:3). Jesus said, "'Before Abraham was born, I am'" (Jn 8:58). "His goings forth are from long ago, from the days of eternity" (Mic 5:2).
"For by Him all things were created, both in the heavens and on earth, visible and invisible" (Col 1:16). "He is before all things, and in Him all things hold together" (:17). "All things came into being through Him, and apart from Him nothing came into being that has come into being" (Jn 1:3). "'You, Lord, in the beginning laid the foundation of the earth, and the heavens are the works of Your hands'" (Heb 1:10). "The world was made through Him" (Jn 1:10). It is He "for whom are all things, and through whom are all things" (Heb 2:10).
We understand Jesus' pre-existence and everlastingness. He was the "only begotten from the Father" (Jn 1:14). John the Baptist declared, "'I did not recognize Him, but He who sent me to baptize in water said to me, 'He upon whom you see the Spirit descending and remaining upon Him, this is the One who baptizes in the Holy Spirit'" (1:33). The Father communicated this to John. It was the "eternal Spirit" (Heb 9:14) about whom "John testified saying, 'I have seen the Spirit descending as a dove out of heaven'" (Jn 1:32). John questioned his role in this and Jesus answered, "'Permit it at this time; for in this way it is fitting for us to fulfill all righteousness'" (Mt 3:15). Here were the three equal members of the Godhead working together in a triune way. John explains that "the Word became flesh, and dwelt among us, and we saw His Glory'" (Jn 1:14). Furthermore "God has given us eternal life, and this life is in His Son" (1Jn 5:11).