Narada Purana — Purva Bhaga, Shloka 13
Dīkṣā, Mantra-Types, Mantra-Doṣas, and Qualifications of Ācārya–Śiṣya
शांतोऽपि रौद्रतामेति हुंफट्पल्लवयोजनात् । छिन्नादिदोषयुक्तास्ते नैव रक्षंति साधकम् ॥ १३ ॥
śāṃto'pi raudratāmeti huṃphaṭpallavayojanāt | chinnādidoṣayuktāste naiva rakṣaṃti sādhakam || 13 ||
即便是“Śānti”（息灾、安抚）之仪，若加缀“huṃ”“phaṭ”二音，也会转为“Raudra”（忿怒）之势。凡有缺失、如被截断等过失的真言，丝毫不能护佑修行者。
Sanatkumara (in instruction to Narada)
Vrata: none
Primary Rasa: bhayanaka
Secondary Rasa: shanta
FAQs
It stresses mantra-śuddhi (correctness): the intended spiritual effect depends on precise application, and defective or improperly modified mantras fail to safeguard the sādhaka.
By warning against careless ritualism, it indirectly supports bhakti’s emphasis on sincerity and right practice—devotion should be guided by proper śāstra so one’s worship does not become harmful or misdirected.
Ritual-technical knowledge akin to Kalpa and mantra-prayoga: adding bīja-syllables (huṃ/phaṭ) can shift a rite’s category (śānti to raudra), and textual faults like truncation (chinna) invalidate protective efficacy.