But you are not in the flesh; you are in the Spirit, if in fact the Spirit of God lives in you. Anyone who does not have the Spirit of Christ does not belong to him.
In context
7The mind set on the flesh is hostile to God: it does not submit to God’s law—it cannot. 8Those who are in the flesh cannot please God. 9But you are not in the flesh; you are in the Spirit, if in fact the Spirit of God lives in you. Anyone who does not have the Spirit of Christ does not belong to him. 10And if Christ is in you, then although the body is dead because of sin, the Spirit is life because of righteousness. 11And if the Spirit of him who raised Jesus from the dead lives in you, then he who raised Christ Jesus from the dead will also give life to your mortal bodies through his Spirit living in you.