Narada Purana — Purva Bhaga, Shloka 20
Dīkṣā, Mantra-Types, Mantra-Doṣas, and Qualifications of Ācārya–Śiṣya
दोषा ह्येते समाख्याता वक्ष्याम्येषां च लक्षणम् । संयुक्तं वा वियुक्तं वा त्रिधा वा स्वरसंयुतम् ॥ २० ॥
doṣā hyete samākhyātā vakṣyāmyeṣāṃ ca lakṣaṇam | saṃyuktaṃ vā viyuktaṃ vā tridhā vā svarasaṃyutam || 20 ||
诸过失确已列举；今我将宣说其差别之相——或相合而起，或各别而现，或与三种声调重音（svara）相系而成。
Sanatkumara (in dialogue teaching Narada)
Vrata: none
Primary Rasa: shanta
Secondary Rasa: adbhuta
FAQs
It emphasizes that mantra-power depends on precision: knowing the defining marks of recitation faults protects the integrity of Vedic sound, which is treated as sacred and spiritually efficacious.
While primarily technical (Śikṣā), it supports bhakti by insisting that devotional and Vedic chanting should be done correctly—right sound and right accent become a disciplined offering (sevā) rather than careless utterance.
Vedāṅga Śikṣā: classification and diagnosis of chanting defects, especially those tied to svara (Vedic pitch accents) and whether errors arise in combined (saṃyukta) or separated (viyukta) phonetic contexts.