Mbh 12.303.3a

"'"Vasishtha said, 'Hear, O lord of Earth, as to how this universe is destroyed, and, of That which was never destroyed and which will never be destroyed at any time. Twelve thousand years, (according to the measure of the celestials), make a Yuga, four such Yugas taken a thousand times, make a Kalpa which measures one day of Brahman.[1609] Brahman's night also, O king, is of the same measure. When Brahman himself is destroyed,[1610] Sambhu of formless soul and to whom the Yuga attributes of Anima, Laghima, &c, naturally inhere, awakes, and once more creates that First or Eldest of all creatures, possessed of vast proportions, of infinite deeds, endued with form, and identifiable with the universe. That Sambhu is otherwise called Isana (the lord of everything). He is pure Effulgence, and transcends all deterioration, having his hands and feet stretching in all directions, with eyes and head and mouth everywhere, and with ears also in every place. That Being exists, overwhelming the entire universe. The eldest-born Being is called Hiranyagarbha. This holy one has (in the Vedanta) been called the Understanding. In the Yuga scriptures He is called the Great, and Virinchi, and the Unborn. In the Sankhya scriptures, He is indicated by diverse name, and regarded as having Infinity for his Soul. Of diverse forms and constituting the soul of the universe, He is regarded as One and Indestructible. The three worlds of infinite ingredients have been created by Him without assistance from any source and have been overwhelmed by him. In consequence of His manifold forms, He is said to be of universal form. Undergoing modifications He creates Himself by Himself. Endued with mighty energy, He first creates Consciousness and that Great Being called Prajapati endued with Consciousness. The Manifest (or Hiranyagarbha) is created from the Unmanifest. This is called by the learned the Creation of Knowledge.