Cundī dhāraṇī or mantra also to start with appeared in the Kāraṇḍavyūhasūtra: namaḥ saptānāṃ samyaksaṃbuddha koṭīnāṃ tadyathā oṃ cale cule cunde svāhā The usage of mantra or the repetition of certain phrases in Pali is really a extremely frequent kind of meditation in the Theravada tradition. Easy mantras use repetition https://www.youtube.com/@Mahavidyabaglamukhi/