May I ask what the Holy Spirit taught you that was not scripture before Jesus died? Would you possibly make exception for Jesus' revealed word (Gal 1:12); that very word that became the fulfilled word of God? Col 1:25. Do you realize that none before Paul was ever made aware of the things God had planned for us?
The Holy Spirit taught me while reading God’s word. It was like sitting down in class and asking the teacher questions when you didn’t understand something. The Holy Spirit does not teach outside of God’s word, so I’m not sure what it is you are asking?
You are referring to (I’ve bolded it)
1 Corinthians 2:6-16 NIV
6We do, however, speak a message of wisdom among the mature, but not the wisdom of this age or of the rulers of this age, who are coming to nothing. 7No, we declare God’s wisdom, a mystery that has been hidden and that God destined for our glory before time began. 8None of the rulers of this age understood it, for if they had, they would not have crucified the Lord of glory.
9However, as it is written:
“What no eye has seen,
what no ear has heard,
and what no human mind has conceived”b —
the things God has prepared for those who love him—
10these are the things God has revealed to us by his Spirit.
The Spirit searches all things, even the deep things of God. 11For who knows a person’s thoughts except their own spirit within them? In the same way no one knows the thoughts of God except the Spirit of God. 12What we have received is not the spirit of the world, but the Spirit who is from God, so that we may understand what God has freely given us.
13This is what we speak, not in words taught us by human wisdom but in words taught by the Spirit, explaining spiritual realities with Spirit-taught words.c 14The person without the Spirit does not accept the things that come from the Spirit of God but considers them foolishness, and cannot understand them because they are discerned only through the Spirit. 15The person with the Spirit makes judgments about all things, but such a person is not subject to merely human judgments, 16for,
“Who has known the mind of the Lord
so as to instruct him?”d
But we have the mind of Christ.
John 1 NIV
1Word was with God, and the Word was God. 2He was with God in the beginning. 3Through him all things were made; without him nothing was made that has been made. 4In him was life, and that life was the light of all mankind. 5The light shines in the darkness, and the darkness has not overcomea it.
6There was a man sent from God whose name was John. 7He came as a witness to testify concerning that light, so that through him all might believe. 8He himself was not the light; he came only as a witness to the light.
9The true light that gives light to everyone was coming into the world. 10He was in the world, and though the world was made through him, the world did not recognize him. 11He came to that which was his own, but his own did not receive him. 12Yet to all who did receive him, to those who believed in his name, he gave the right to become children of God— 13children born not of natural descent, nor of human decision or a husband’s will, but born of God.
14The Word became flesh and made his dwelling among us. We have seen his glory, the glory of the one and only Son, who came from the Father, full of grace and truth.
15(John testified concerning him. He cried out, saying, “This is the one I spoke about when I said, ‘He who comes after me has surpassed me because he was before me.’ ”) 16Out of his fullness we have all received grace in place of grace already given. 17For the law was given through Moses; grace and truth came through Jesus Christ. 18No one has ever seen God, but the one and only Son, who is himself God andb is in closest relationship with the Father, has made him known.
1 John 2:22-23 NIV
22Who is the liar? It is whoever denies that Jesus is the Christ. Such a person is the antichrist—denying the Father and the Son. 23No one who denies the Son has the Father; whoever acknowledges the Son has the Father also.
1 John 4:2-5 NIV
2This is how you can recognize the Spirit of God:
Every spirit that acknowledges that Jesus Christ has come in the flesh is from God, 3but every spirit that does not acknowledge Jesus is not from God. This is the spirit of the antichrist, which you have heard is coming and even now is already in the world.
4You, dear children, are from God and have overcome them, because the one who is in you is greater than the one who is in the world. 5They are from the world and therefore speak from the viewpoint of the world, and the world listens to them. 6We are from God, and whoever knows God listens to us; but whoever is not from God does not listen to us. This is how we recognize the Spirita of truth and the spirit of falsehood.
Ephesians 1:4-14 NIV
4For he chose us in him before the creation of the world to be holy and blameless in his sight. In love 5heb predestined us for adoption to sonshipc through Jesus Christ, in accordance with his pleasure and will— 6to the praise of his glorious grace, which he has freely given us in the One he loves. 7In him we have redemption through his blood, the forgiveness of sins, in accordance with the riches of God’s grace 8that he lavished on us. With all wisdom and understanding, 9hed made known to us the mystery of his will according to his good pleasure, which he purposed in Christ, 10to be put into effect when the times reach their fulfillment—to bring unity to all things in heaven and on earth under Christ.
11In him we were also chosen,e having been predestined according to the plan of him who works out everything in conformity with the purpose of his will, 12in order that we, who were the first to put our hope in Christ, might be for the praise of his glory. 13And you also were included in Christ when you heard the message of truth, the gospel of your salvation. When you believed, you were marked in him with a seal, the promised Holy Spirit, 14who is a deposit guaranteeing our inheritance until the redemption of those who are God’s possession—to the praise of his glory
I hope that answers your questions sufficiently enough.