Jesus was talking about the Holy Spirit, who would be given to everyone that had faith in him. The Spirit had not yet been given to anyone, since Jesus had not yet been given his full glory.
When you climbed the high mountain, you took prisoners with you and were given gifts. Your enemies didn't want you to live there, but they gave you gifts.
John said, "I am just baptizing with water. But someone more powerful is going to come, and I am not good enough even to untie his sandals. He will baptize you with the Holy Spirit and with fire.
Before this I didn't know who he was. But the one who sent me to baptize with water had told me, "You will see the Spirit come down and stay on someone. Then you will know that he is the one who will baptize with the Holy Spirit."
At first, Jesus' disciples did not understand. But after he had been given his glory, they remembered all this. Everything had happened exactly as the Scriptures said it would.
But the Holy Spirit will come and help you, because the Father will send the Spirit to take my place. The Spirit will teach you everything and will remind you of what I said while I was with you.
But I tell you that I am going to do what is best for you. That is why I am going away. The Holy Spirit cannot come to help you until I leave. But after I am gone, I will send the Spirit to you.
After Jesus had finished speaking to his disciples, he looked up toward heaven and prayed: Father, the time has come for you to bring glory to your Son, in order that he may bring glory to you.
"When the last days come, I will give my Spirit to everyone. Your sons and daughters will prophesy. Your young men will see visions, and your old men will have dreams.
Jesus was taken up to sit at the right side of God, and he was given the Holy Spirit, just as the Father had promised. Jesus is also the one who has given the Spirit to us, and that is what you are now seeing and hearing.
The God that Abraham, Isaac, Jacob, and our other ancestors worshiped has brought honor to his Servant Jesus. He is the one you betrayed. You turned against him when he was being tried by Pilate, even though Pilate wanted to set him free.
You are no longer ruled by your desires, but by God's Spirit, who lives in you. People who don't have the Spirit of Christ in them don't belong to him.