2 Thessalonians 2:13-15

But we always must thank God for you, brothers and sisters who are loved by God. This is because he chose you from the beginning to be the first crop of the harvest. This brought salvation, through your dedication to God by the Spirit and through your belief in the truth. God called all of you through our good news so you could possess the honor of our Lord Jesus Christ. So then, brothers and sisters, stand firm and hold on to the traditions we taught you, whether we taught you in person or through our letter.