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An example of such wrong utterance is typically explained by the legend of Vrttrasura's birth:            <blockquote>मन्त्रो हीनः स्वरतो वर्णतो वा मिथ्या प्रयुक्तो न तमर्थमाह । स वाग्वज्रो यजमानं हिनस्ति यथेन्द्रशत्रुः स्वरतोपराधात् ॥</blockquote><blockquote>mantro hīnaḥ svarato varṇato vā mithyā prayukto na tamarthamāha । sa vāgvajro yajamānaṃ hinasti yathendraśatruḥ svaratoparādhāt ॥</blockquote>If a mantra is devoid of a वर्णः || varna (letter), or has wrong utterances or स्वरः || svaras, then it does not the give the meaning it is intended to and produces a false meaning. This incorrectly and improperly uttered mantra becomes a वाक्वज्रः || vakvajra (word weapon) and is capable of destroying the यजमानः || yajamana (performer of the yajna). Example is the famous story of Indra's enemy, वृत्रासुरः ॥ Vrttrasura whose origin was due to स्वरापराधः ॥ svaraparadha (wrong svara utterance) of a mantra.             

An example of such wrong utterance is typically explained by the legend of Vrttrasura's birth:            <blockquote>मन्त्रो हीनः स्वरतो वर्णतो वा मिथ्या प्रयुक्तो न तमर्थमाह । स वाग्वज्रो यजमानं हिनस्ति यथेन्द्रशत्रुः स्वरतोपराधात् ॥</blockquote><blockquote>mantro hīnaḥ svarato varṇato vā mithyā prayukto na tamarthamāha । sa vāgvajro yajamānaṃ hinasti yathendraśatruḥ svaratoparādhāt ॥</blockquote>If a mantra is devoid of a वर्णः || varna (letter), or has wrong utterances or स्वरः || svaras, then it does not the give the meaning it is intended to and produces a false meaning. This incorrectly and improperly uttered mantra becomes a वाक्वज्रः || vakvajra (word weapon) and is capable of destroying the यजमानः || yajamana (performer of the yajna). Example is the famous story of Indra's enemy, वृत्रासुरः ॥ Vrttrasura whose origin was due to स्वरापराधः ॥ svaraparadha (wrong svara utterance) of a mantra.             

==== '''वृत्रासुर जननम्  || Vrttrasura Janana'''  ====

==== '''वृत्रासुर-जननम्  || Vrttrasura Janana'''  ====

<blockquote>तत्त्वष्टाहवनीयमुप प्रावर्तयत्स्वाहेन्द्रशत्रुर्वर्धस्वेति यदवर्तयत्तद्वृत्रस्य वृत्रत्वं यदब्रवीत्स्वाहेन्द्रशत्रुर्वर्धस्वेति तस्मादस्येन्द्रः शत्रुरभवत् | (Tait. Samh. 2.5.2)<ref name=":1">Taittriya [http://parankusa.org/KrYajurBrowse.aspx Samhita] </ref></blockquote><blockquote>tattvaṣṭāhavanīyamupa prāvartayatsvāhendraśatrurvardhasveti yadavartayattadvṛtrasya vṛtratvaṃ yadabravītsvāhendraśatrurvardhasveti tasmādasyendraḥ śatrurabhavat | (Tait. Samh. 2.5.2)<ref name=":1">Taittriya [http://parankusa.org/KrYajurBrowse.aspx Samhita] </ref></blockquote><blockquote>त्वष्टा॥ Tvasta angered by Indra's killing of his son विश्वरूपः  || Vishwaroopa, initiates an अभिचारिक-यागः  || abhicharika yaga (a [[yaga]] performed to cause harm to an intended person) to procure a son to kill Indra. The ऋत्विज्  || rtvijas were to utter the mantra "इन्द्रशत्रुर्वर्धस्व" with अन्त-उदात्तः ॥ Anta-Udatta or Udatta svara in the end of the mantra (to mean, Prosper Oh ! Enemy of Indra). Instead, they used the आद्य-उदात्तः ॥ Adya Udatta svara in the beginning of the mantra (meaning, Oh! Indra, one who has enemies, Prosper).So, instead of asking for the rise and prosperity of a son to take revenge on Indra, the Rtvijas asked for the prosperity and glory of Indra who destroyed असुराः  || Asuras. Thus, वृत्रासुरः  '''||''' Vrttrasura, the son of Tvasta was born, an enemy of Indra, but eventually Indra was rewarded with glory in killing Vrttrasura.</blockquote>Shiksha literature is very widely available based on the different शाखा || shakhas (divisions) of different vedas. They are पाणिनीयशिक्षा || Panineeya Shiksha, व्यासशिक्षा || Vyasashiksha, भारद्वाजशिक्षा || Bharadvaja shiksha, याज्ञवलक्यशिक्षा || Yajnavalkya Shiksha, पराशरशिक्षा || Parashara shiksha, वासिष्टीशिक्षा || Vasishtee shiksha, कात्यायनीशिक्षा || Katyayanee shiksha, माध्यन्दिनीशिक्षा || Madhyandinee shiksha, केशवीशिक्षा || Keshavee shiksha, अमोघानन्दिनीशिक्षा || Amoghanandinee shiksha, माण्डव्यशिक्षा || Mandavya shiksha, मल्लशर्मशिक्षा || Mallasharma shiksha, स्वराकुशशिक्षा || Svarakusha shiksha, षोडशशिक्षा || Shodasha shiksha, नारदीयशिक्षा || Naradeeya shiksha, माण्डुकीयशिक्षा || Mandukeeya shiksha, स्वरभक्तिलक्षणशिक्षा || Svarabhaktilakshana,  अवसाननिर्णयशिक्षा || Avasananirnaya shiksha, वर्णरत्नप्रदीपिकाशिक्षा || Varnaratna pradeepika shiksha among many others.

<blockquote>तत्त्वष्टाहवनीयमुप प्रावर्तयत्स्वाहेन्द्रशत्रुर्वर्धस्वेति यदवर्तयत्तद्वृत्रस्य वृत्रत्वं यदब्रवीत्स्वाहेन्द्रशत्रुर्वर्धस्वेति तस्मादस्येन्द्रः शत्रुरभवत् | (Tait. Samh. 2.5.2)<ref name=":1">Taittriya [http://parankusa.org/KrYajurBrowse.aspx Samhita] </ref></blockquote><blockquote>tattvaṣṭāhavanīyamupa prāvartayatsvāhendraśatrurvardhasveti yadavartayattadvṛtrasya vṛtratvaṃ yadabravītsvāhendraśatrurvardhasveti tasmādasyendraḥ śatrurabhavat | (Tait. Samh. 2.5.2)<ref name=":1">Taittriya [http://parankusa.org/KrYajurBrowse.aspx Samhita] </ref></blockquote><blockquote>त्वष्टा॥ Tvasta angered by Indra's killing of his son विश्वरूपः  || Vishwaroopa, initiates an अभिचारिक-यागः  || abhicharika yaga (a [[yaga]] performed to cause harm to an intended person) to procure a son to kill Indra. The ऋत्विज्  || rtvijas were to utter the mantra "इन्द्रशत्रुर्वर्धस्व" with अन्त-उदात्तः ॥ Anta-Udatta or Udatta svara in the end of the mantra (to mean, Prosper Oh ! Enemy of Indra). Instead, they used the आद्य-उदात्तः ॥ Adya Udatta svara in the beginning of the mantra (meaning, Oh! Indra, one who has enemies, Prosper).So, instead of asking for the rise and prosperity of a son to take revenge on Indra, the Rtvijas asked for the prosperity and glory of Indra who destroyed असुराः  || Asuras. Thus, वृत्रासुरः  '''||''' Vrttrasura, the son of Tvasta was born, an enemy of Indra, but eventually Indra was rewarded with glory in killing Vrttrasura.</blockquote>Shiksha literature is very widely available based on the different शाखा || shakhas (divisions) of different vedas. They are पाणिनीयशिक्षा || Panineeya Shiksha, व्यासशिक्षा || Vyasashiksha, भारद्वाजशिक्षा || Bharadvaja shiksha, याज्ञवलक्यशिक्षा || Yajnavalkya Shiksha, पराशरशिक्षा || Parashara shiksha, वासिष्टीशिक्षा || Vasishtee shiksha, कात्यायनीशिक्षा || Katyayanee shiksha, माध्यन्दिनीशिक्षा || Madhyandinee shiksha, केशवीशिक्षा || Keshavee shiksha, अमोघानन्दिनीशिक्षा || Amoghanandinee shiksha, माण्डव्यशिक्षा || Mandavya shiksha, मल्लशर्मशिक्षा || Mallasharma shiksha, स्वराकुशशिक्षा || Svarakusha shiksha, षोडशशिक्षा || Shodasha shiksha, नारदीयशिक्षा || Naradeeya shiksha, माण्डुकीयशिक्षा || Mandukeeya shiksha, स्वरभक्तिलक्षणशिक्षा || Svarabhaktilakshana,  अवसाननिर्णयशिक्षा || Avasananirnaya shiksha, वर्णरत्नप्रदीपिकाशिक्षा || Varnaratna pradeepika shiksha among many others.

=== कल्पः ॥ Kalpa ===

=== कल्पः ॥ Kalpa ===