First Epistle to the Thessalonians
Most New Testament scholars believe Paul wrote this letter from Corinth, most of the letter has personal information, with only the last two chapters teaching things about what Christians are to believe. Paul's main goal is to encourage and reassure the Christians there. Paul tells them to go on working quietly while waiting in hope for the return of Christ.  Paul also teaches that the dead will be resurrected prior to those still living, and both groups will greet the Lord (Jesus) in the air. These verses are often read at funerals of Christians to comfort their families.