1 Thessalonians 1:5-6 NIV

5 because our gospel came to you not simply with words but also with power, with the Holy Spirit and deep conviction. You know how we lived among you for your sake.

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6 You became imitators of us and of the Lord, for you welcomed the message in the midst of severe suffering with the joy given by the Holy Spirit.

References for 1 Thessalonians 1:6