1-2:Therefore, there is now no condemnation for those who are in Christ Jesus, because through Christ Jesus the law of the Spirit of life set me free from the law of sin and death.What we see in chapter 8 are references to God, Jesus and the Spirit and how they relate to each other. There is more in chapter 8 that best fits into the concept of the Trinity as well.5: Those who live according to the sinful nature have their minds set on what that nature desires; but those who live in accordance with the Spirit have their minds set on what the Spirit desires.
9: You, however, are controlled not by the sinful nature but by the Spirit, if the Spirit of God lives in you. And if anyone does not have the Spirit of Christ, he does not belong to Christ.
13-14: For if you live according to the sinful nature, you will die; but if by the Spirit you put to death the misdeeds of the body, you will live, because those who are led by the Spirit of God are sons of God.
33-35: Who will bring any charge against those whom God has chosen? It is God who justifies. Who is he that condemns? Christ Jesus, who died—more than that, who was raised to life—is at the right hand of God and is also interceding for us. Who shall separate us from the love of Christ?
"But Peter said, Ananias, why hath Satan filled thine heart to lie to the Holy Spirit...Why hast thou conceived this thing in thine heart. Thou hast not lied unto men, but unto God."
Clearly from this verse, the Holy Spirit is God.