Paul writes 1 Thessalonians from Corinth
Paul, Silvanus, and Timothy addressed the Thessalonian believers after Timothy returned with news of their faith and love. They thanked God for the church's endurance, urged believers toward holiness, and comforted those grieving the dead with the hope of the Lord's coming (1 Thessalonians 1:1-10; 3:1-13; 4:1-5:24). Timothy and Silas joined Paul in Corinth during this ministry (Acts 18:1-11).
Written during Paul's Corinth ministry after Timothy returned from Macedonia; Scripture gives no calendar year for the letter
1Paul, Silvanus, and Timothy, To the church of the Thessalonians in God the Father and the Lord Jesus Christ: Grace and peace to you. 2We always thank God for all of you, remembering you in our prayers 3and continually recalling before our God and Father your work of faith, your labor of love, and your enduring hope in our Lord Jesus Christ.