What is Paul's letter focusing on Christ's return?

Paul's letters that focus on Christ's return are primarily found in 1 Thessalonians and 2 Thessalonians. In these letters, he reassures believers about the Second Coming of Christ, emphasizing the hope and encouragement it brings amidst suffering and persecution. Paul explains that the dead in Christ will rise first, and all believers will be transformed at His return. He also urges the community to remain vigilant and live righteously in anticipation of this event.