Cundī dhāraṇī or mantra also 1st appeared in the Kāraṇḍavyūhasūtra: namaḥ saptānāṃ samyaksaṃbuddha koṭīnāṃ tadyathā oṃ cale cule cunde svāhā The usage of mantra or even the repetition of certain phrases in Pali is usually a remarkably frequent kind of meditation inside the Theravada tradition. Very simple mantras use repetition https://www.youtube.com/@Mahavidyabaglamukhi/