1 Peter 4:6
"For for this cause was the gospel preached also to them that are dead, that they might be judged according to men in the flesh, but live according to God in the spirit."
Cross References (ranked by relevance)
Romans 8:2
13
For the law of the Spirit of life in Christ Jesus hath made me free from the law of sin and death.
1 Peter 3:19
12
By which also he went and preached unto the spirits in prison;
Galatians 5:25
If we live in the Spirit, let us also walk in the Spirit.
Matthew 24:9
Then shall they deliver you up to be afflicted, and shall kill you: and ye shall be hated of all nations for my name’s sake.