1 Thessalonians 2:3

For our exhortation is not of error, nor of uncleanness, nor in guile:

The Thessalonians were familiar with the pretensions, deceit and gross immorality which marked the pagan worship throughout the world of those days, especially among the Gentiles; and it is the contrast with paganism, not Paul's defense of himself from slander, which shines in a passage like this. Commenting on the word "uncleanness," Dummelow observed that "Impurity was often associated with heathen worship, and this was especially the case at Thessalonica and Corinth."[8]