The Bible:
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2 Kings 5 Healing of Naaman
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Psalm 107 Thanksgiving Psalm
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Leviticus 13:1-46 On cleanliness and skin disorders
The Catechism of the Catholic Church (CCC)
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CCC 2648 Give Thanks in All Circumstances
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CCC 1328-1405 Worshipping God at Mass
Official Church Documents:
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Mysterium Fidei 66, Encyclical of Pope St. Paul VI on the Holy Eucharist
Other Sources:
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The Leper and Evangelization, Homily from Bishop Robert Barron
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The Anointing of the Sick, Video from Bishop Robert Barron