1 Thessalonians 1:5

1:5 in that our gospel did not come to you merely in words, but in power and in the Holy Spirit and with deep conviction (surely you recall the character we displayed when we came among you to help you).

1 Thessalonians 3:13

3:13 so that your hearts are strengthened in holiness to be blameless before our God and Father at the coming of our Lord Jesus with all his saints.