John 8:42 - Jesus said unto them, If God were your Father, ye would love me: for I proceeded forth and came from God; neither came I of myself, but he sent me.
John 12:45-50 - And he that seeth me seeth him that sent me. I am come a light into the world, that whosoever believeth on me should not abide in darkness. And if any man hear my words, and believe not, I judge him not: for I came not to judge the world, but to save the world. He that rejecteth me, and receiveth not my words, hath one that judgeth him: the word that I have spoken, the same shall judge him in the last day. For I have not spoken of myself; but the Father which sent me, he gave me a commandment, what I should say, and what I should speak. And I know that his commandment is life everlasting: whatsoever I speak therefore, even as the Father said unto me, so I speak.
John 8:28-29 - Then said Jesus unto them, When ye have lifted up the Son of man, then shall ye know that I am he, and that I do nothing of myself; but as my Father hath taught me, I speak these things.And he that sent me is with me: the Father hath not left me alone; for I do always those things that please him.
It seems to me, that Jesus was with God, prior to sending Him to us.....Galatians 4:4 - But when the fulness of the time was come, God sent forth his Son, made of a woman, made under the law,
Once Jesus took on the form of a servant (man) and remained true to God, as a man, He was exalted by God Phillipians 2:8-10 -8And being found in fashion as a man, he humbled himself, and became obedient unto death, even the death of the cross. Wherefore God also hath highly exalted him, and given him a name which is above every name: That at the name of Jesus every knee should bow, of things in heaven, and things in earth, and things under the earth;
I can't find Jesus' name in the Bible, prior to Him becoming man. If there is scripture, please let me know.
Conclusion (finally, lol).....Jesus's spirit was with God, prior to Him being sent to us. Jesus chose to come, as MAN, a servant. Jesus was obedient through and through and God "rewarded", His term exalted, Jesus to King of ALL.
Jesus did not go back "into God"...but is now WITH Him, seated on God's right, as King of all. God the Father, Jesus the Son and the Holy Spirit work in unison....ALWAYS.