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I should also consider possible typos. "Khisti" could be a misspelling of "Ksitigarbha," a Bodhisattva important in Mahayana Buddhism. The "Ksitigarbha Sutra" includes a chapter on the Bodhisattva's vows. If that's the case, the user might be looking for an MP3 version of the Ksitigarbha Sutra or a related poem.