1 Corinthians 4:20

"For the kingdom of God is not in word, but in power."

Cross References (ranked by relevance)

And my speech and my preaching was not with enticing words of man’s wisdom, but in demonstration of the Spirit and of power:

1 Thessalonians 1:5 43

For our gospel came not unto you in word only, but also in power, and in the Holy Ghost, and in much assurance; as ye know what manner of men we were among you for your sake.

Romans 14:17 35

For the kingdom of God is not meat and drink; but righteousness, and peace, and joy in the Holy Ghost.

Romans 1:16 27

For I am not ashamed of the gospel of Christ: for it is the power of God unto salvation to every one that believeth; to the Jew first, and also to the Greek.

Romans 15:19 25

Through mighty signs and wonders, by the power of the Spirit of God; so that from Jerusalem, and round about unto Illyricum, I have fully preached the gospel of Christ.

1 Corinthians 1:24 23

But unto them which are called, both Jews and Greeks, Christ the power of God, and the wisdom of God.