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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 varna (letter), or has wrong utterances or 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 vakvajra (वाक्वज्रः | word weapon) and is capable of destroying the yajamana (performer of the yajna). Example is the famous story of Indra's enemy, [[Vrtrasura (वृत्रासुरः)|Vrtrasura]] (वृत्रासुरः) whose origin was due to svaraparadha (स्वरापराधः | 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 varna (letter), or has wrong utterances or 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 vakvajra (वाक्वज्रः | word weapon) and is capable of destroying the yajamana (performer of the yajna). Example is the famous story of Indra's enemy, [[Vrtrasura (वृत्रासुरः)|Vrtrasura]] (वृत्रासुरः) whose origin was due to svaraparadha (स्वरापराधः | 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>Tvasta (त्वष्टा) angered by Indra's killing of his son Vishwaroopa, initiates an abhicharika yaga (अभिचारिक-यागः | a yaga performed to cause harm to an intended person) to procure a son to kill Indra. The [[Rtvik (ऋत्विक्)|rtvijas]] (ऋत्विज्-s) were to utter the mantra "इन्द्रशत्रुर्वर्धस्व" with Anta-Udatta (अन्त-उदात्तः) or Udatta svara in the end of the mantra (to mean, Prosper Oh ! Enemy of Indra). Instead, they used the Adya Udatta (आद्य-उदात्तः) or 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 Asuras. Thus, Vrtrasura, the son of Tvasta was born, an enemy of Indra, but eventually Indra was rewarded with glory in killing Vrtrasura.</blockquote>Shiksha literature is very widely available based on the different shakhas (शाखा-s | divisions) of different vedas. They are Panineeya Shiksha (पाणिनीयशिक्षा), Vyasashiksha (व्यासशिक्षा), Bharadvaja shiksha (भारद्वाजशिक्षा), Yajnavalkya Shiksha (याज्ञवलक्यशिक्षा), Parashara shiksha (पराशरशिक्षा), Vasishtee shiksha (वासिष्टीशिक्षा), Katyayanee shiksha (कात्यायनीशिक्षा), Madhyandinee shiksha (माध्यन्दिनीशिक्षा), Keshavee shiksha (केशवीशिक्षा), Amoghanandinee shiksha (अमोघानन्दिनीशिक्षा), Mandavya shiksha (माण्डव्यशिक्षा), Mallasharma shiksha (मल्लशर्मशिक्षा), Svarakusha shiksha (स्वराकुशशिक्षा), Shodasha shiksha (षोडशशिक्षा), Naradeeya shiksha (नारदीयशिक्षा), Mandukeeya shiksha ( माण्डुकीयशिक्षा), Svarabhaktilakshana (स्वरभक्तिलक्षणशिक्षा), Avasananirnaya shiksha (अवसाननिर्णयशिक्षा), Varnaratna pradeepika shiksha (वर्णरत्नप्रदीपिकाशिक्षा) 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>Tvasta (त्वष्टा) angered by Indra's killing of his son Vishwaroopa, initiates an abhicharika yaga (अभिचारिक-यागः | a yaga performed to cause harm to an intended person) to procure a son to kill Indra. The [[Rtvik (ऋत्विक्)|rtvijas]] (ऋत्विज्-s) were to utter the mantra "इन्द्रशत्रुर्वर्धस्व" with Anta-Udatta (अन्त-उदात्तः) or Udatta svara in the end of the mantra (to mean, Prosper Oh ! Enemy of Indra). Instead, they used the Adya Udatta (आद्य-उदात्तः) or 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 Asuras. Thus, Vrtrasura, the son of Tvasta was born, an enemy of Indra, but eventually Indra was rewarded with glory in killing Vrtrasura.</blockquote>Shiksha literature is very widely available based on the different shakhas (शाखा-s | divisions) of different vedas. They are Panineeya Shiksha (पाणिनीयशिक्षा), Vyasashiksha (व्यासशिक्षा), Bharadvaja shiksha (भारद्वाजशिक्षा), Yajnavalkya Shiksha (याज्ञवलक्यशिक्षा), Parashara shiksha (पराशरशिक्षा), Vasishtee shiksha (वासिष्टीशिक्षा), Katyayanee shiksha (कात्यायनीशिक्षा), Madhyandinee shiksha (माध्यन्दिनीशिक्षा), Keshavee shiksha (केशवीशिक्षा), Amoghanandinee shiksha (अमोघानन्दिनीशिक्षा), Mandavya shiksha (माण्डव्यशिक्षा), Mallasharma shiksha (मल्लशर्मशिक्षा), Svarakusha shiksha (स्वराकुशशिक्षा), Shodasha shiksha (षोडशशिक्षा), Naradeeya shiksha (नारदीयशिक्षा), Mandukeeya shiksha ( माण्डुकीयशिक्षा), Svarabhaktilakshana (स्वरभक्तिलक्षणशिक्षा), Avasananirnaya shiksha (अवसाननिर्णयशिक्षा), Varnaratna pradeepika shiksha (वर्णरत्नप्रदीपिकाशिक्षा) among many others.

=== कल्पः ॥ Kalpa ===

=== कल्पः ॥ Kalpa ===