Yajnavalkya was the son of the sister of Mahamuni Vaishampayana, the Vedacharya of the Taittiriya section. He was studying the Taittiriya Samhita from Vaishampayana who was also his Guru. Vaishampayana had many other disciples too and they all were students of the Taittiriya Shakha.
Once all the Rishis decided to form an association near the Meru mountain and made a rule that any Rishi who absented himself at the appointed hour should incur the sin of Brahmahatya (the sin of killing a Brahmin) for seven days. On that appointed day fell the Sraddha ceremony of Vaishampayana’s father. Vaishampayana thought, "Somehow I have to perform my father’s ceremony. If the sin of Brahmahatya comes to me, my disciples will observe the expiatory penance therefor". So Vaishampayana did not attend the meeting of the Rishis. And accordingly he incurred the sin of Brahmahatya.
Then Vaishampayana said to his disciples, "Now I have to expiate this great sin of Brahmahatya. Therefore, you all will observe, for my sake, an expiatory penance for seven days".
At once Yajnavalkya stood up and said, "O Guru! All these are poor-spirited young students. They will not be able to undergo such a hard penance. So, instead of all, I myself alone shall observe it in the manner in which nobody else can". Vaishampayana told Yajnavalkya not to undertake it alone. But Yajnavalkya persisted. The preceptor was offended at this audacious attitude of the disciple and said, "O proud one, you are very conceited. You get away from me. Enough of you who is disposed to despise wise Brahmins. Give back to me immediately whatever you have learnt from me".
Upon the order of the Guru, Yajnavalkya, the son of Devarata, vomited out the collection of the Yajus in the form of food. The other disciples ate that food taking the form of the Tittiri birds, because they were very eager to receive the same. They then had the direct revelation of those Yajurveda collections. As the Tittiri birds ate this Veda, it is thenceforth called the Taittiriya Yajurveda. It is also known as Krishna (black) Yajurveda on account of its being vomited substance.
Then Yajnavalkya determined not to have any human Guru thereafter. Thus he began to propitiate the Sun-God, Surya. Yajnavalkya worshipped and extolled the Sun, the master of the Vedas, for the purpose of acquiring the fresh Vedic portions not known to his preceptor, Vaishampayana.
Yajnavalkya said, "Prostration to the glorious Aditya, who in the form of the Atman, abides in all beings. I bow to Him who surrounds all like Akasa, who is one and not separated or distanced by limiting conditions. O Great God, O Creator, I contemplate upon that glowing sphere which lights and warms the whole world! O God who burns all miseries wrought by unrighteous activities, who burns ignorance which is the seed of activity! O Lord, I worship Thy lotus-like feet praised and worshipped by the rulers of the three worlds. Give me those portions of the Veda which are not known to others".
The Sun-God, the glorious Lord Hari, pleased with Yajnavalkya’s penance, assumed the form of a horse and taught the sage such fresh portions of the Yajurveda as were not known to any other. This portion of the Yajurveda goes by the name of Shukla Yajurveda. It is also known as Vajasaneya Yajurveda, because it was evolved in great rapidity by Surya in the form of a horse through his manes. Yajnavalkya divided this Vajasaneya Yajurveda again into fifteen branches, each branch comprising hundreds of Yajus Mantras. Kanva, Madhyandina and others learnt those branches.
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Puranas and Itihasas are derived originally from the Yajur Veda. This is explained by Sri Suta in the Vayu Purana-
itihasa-purananam vaktaram samyag eva hi
mam caiva pratijagraha bhagavan isvarah prabhuh
eka asid yajur-vedas tam caturdha vyakalpayat
catur-hotram abhut tasmins tena yajnam akalpayat
adhvaryavam yajurbhis tu rgbhir hotram tathaiva ca
audgatram samabhis caiva brahmatvam capyatharvabhih
akhyanais capyupakhyanair gathabhir dvija-sattamah
purana-samhitas cakre puranartha-visaradah
yac-chistam tu yajur-veda iti sastrartha-nirnayah
"That almighty Lord (Sri Vyasa) chose me as the qualified speaker of the Itihasasand the Puranas. In the beginning there was only one Veda – the Yajur Veda. This was divided into four portions. From these stemmed the four performances known as the catur-homaby which he (Vyasa) arranged for the performance of sacrifice. The Adhvaryu priest uses the Yajur mantras, the Hotra priest uses the Rg mantras, the Udgata priest uses the Sama mantras, and the Brahma priest uses the Atharva mantras.
O best of all the brahmanas, after this he (Vyasa) who understands the meaning of the Puranas, compiled them and the Itihasas by combining various akhyanas, upakhyanasand gathas. 5 Whatever remained after Vyasa had divided the Vedasinto four divisions was considered to also be the Yajur Veda. Thus is the conclusion of the sastras." (Vayu Purana 60.16-18, 21-22)
The statement of Sri Suta Gosvami in the above verse from Vayu Purana in which he says that ‘Whatever remained after Vyasa had divided the Vedas into four divisions was considered to also be the Yajur Veda’ indicates that the essence of the original Purana(which was the remaining part of the Yajur Veda) became the condensed version of the Purana consisting of four-hundred-thousand slokas, available on the earth-planet.
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