At Salvation, convicting us of our sins, showing us the righteousness of God and his judgement.
John 16: 7 - 11
Unless I go away, the Advocate will not come to you; but if I go, I will send him to you. When he comes, he will prove the world to be in the wrong about sin and righteousness and judgment: about sin, because people do not believe in me; about righteousness, because I am going to the Father, where you can see me no longer; and about judgment, because the prince of this world now stands condemned.
The Holy Spirit is Within Us
When we get get saved the Holy Spirit lives inside of us.
And with that he breathed on them and said, “Receive the Holy Spirit."
And if anyone does not have the Spirit of Christ, they do not belong to Christ. But if Christ is in you, then even though your body is subject to death because of sin, the Spirit gives life because of righteousness. And if the Spirit of him who raised Jesus from the dead is living in you, he who raised Christ from the dead will also give life to your mortal bodies because of his Spirit who lives in you.
The Holy Spirit is Upon Us
We are baptized in the Spirit with power for service. The Spirit comes upon us.
But you will receive power when the Holy Spirit comes on you; and you will be my witnesses in Jerusalem, and in all Judea and Samaria, and to the ends of the earth.”