During the time Paul was in Corinth he wrote letters to encourage the converts in Thessalonica.
"We give thanks to God always for you all, making mention of you in our prayers; remembering without ceasing your work of faith, and labor of love, and patience of hope in our Lord Jesus Christ, in the sight of God and our Father." 1 Thess. 1:2,3
You can read both letters here.
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