1 Corinthians 2:4
And my speech and my preaching was not with enticing words of man's wisdom, but in demonstration of the Spirit and of power:
Torrey's Topical Textbook—AKJV

1 Thessalonians 1:5
For our gospel came not to you in word only, but also in power, and in the Holy Ghost, and in much assurance; as you know what manner of men we were among you for your sake.
Torrey's Topical Textbook—AKJV