Sēnglǚ men fǎnfù niànsòng zhēnyán, jìnrù míngxiǎng zhuàngtài.
The monks repeatedly chanted mantras, entering a meditative state.
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In Buddhism, 真言 translates the Sanskrit word dharani or mantra - sacred syllables believed to carry spiritual power. The 六字真言 (Six-Syllable Mantra) om mani padme hum is the most famous example.