'Power' in the Bible

Because our good news came to you, not in word only, but in power, and in the Holy Spirit, so that you were completely certain of it; even as you saw what our behaviour to you was like from our love to you.

And for this cause we still give praise to God, that, when the word came to your ears through us, you took it, not as the word of man, but, as it truly is, the word of God, which has living power in you who have faith.

For if we have faith that Jesus underwent death and came back again, even so those who are sleeping will come again with him by God's power.