Mbh 12.319.1a

"'"Yajnavalkya said, 'Thou hast asked me, O monarch, of that Supreme Brahma which resides in the Unmanifest. Thy question relates to a deep mystery. Listen to me with close attention, O king! Having conducted myself with humility according to the ordinances laid down by the Rishis I obtained the Yajushes, O king, from Surya. Without the austerest penances I formerly adored the heat-giving deity. The puissant Surya, O sinless one, gratified with me, saying,--"Solicit thou, O regenerate Rishi, the boon upon which thou hast set thy heart, however difficult it may be of acquisition, I shall, with cheerful Soul, grant it to thee. It is very difficult to incline me to grace!" Bowing unto him with a bend of my head, that foremost of heat-giving luminaries was addressed by me in these words, "I have no knowledge of the Yajushes. I desire to know them without loss of time!"--The holy one, thus solicited, told me,--"I shall impart the Yajushes unto thee. Made up of the essence of speech, the goddess Saraswati will enter into thy body." The deity then commanded me to open my mouth. I did as I was commanded. The goddess Saraswati then entered into my body, O sinless one. At this, I began to burn. Unable to endure the pain I plunged into a stream. Not understanding that what the high-souled Surya had done for me was for my good, I became even angry with him. While I was burning with the energy of the goddess, the holy Surya told me,--"Do thou endure this burning sensation for only a little while. That will soon cease and thou wilt be cool." Indeed I became cool. Seeing me restored to ease, the Maker of light said unto me,--"The whole Vedas, with even those parts that are regarded as its appendix, together with the Upanishads, will appear in thee by inward light, O regenerate one! The entire Satapathas also thou wilt edit, O foremost of regenerate ones. After that, thy understanding will turn to the path of Emancipation.