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The great prayer "Adithya Hrudhayam" occurs in the 107th chapter of the Yuddha Kanda (section of war) in Ramayana composed by Sage Valmikhi. When Lord Rama is engaged in ceaseless battle with Ravana, the devas who have assembled in the sky beseech him to seek counsel from Sage Agasthya. Sage Agasthya teaches him about this great prayer and Lord Rama subsequently wins the battle.