Mbh 8.34.8b

The ten foremost of snakes having Dhritarashtra for their first, all exceedingly strong, formed the (other) shaft of that car. The Sky was made its (other) yoke, and the clouds called Samvartaka and Valahaka were the leathern strings of the yoke. The two Twilights and Dhritri and Medha and Sthiti and Sannati, and the firmament bespangled with planets and stars, were made the skins for covering that car. Those Regents of the world, viz., the Lords of the gods, of the waters, of the dead, and of treasures, were made the steeds of that car. Kalaprishtha, and Nahusha, and Karkotaka, and Dhananjaya and the other snakes became the chords for binding the manes of the steeds. The cardinal and the subsidiary directions became the reins of the steeds of that car. The Vedic sound Vashat became the goad, and Gayatri became the string attached to that goad. The four auspicious days were made the traces of the steeds, and the pitris presiding over them were made the hooks and pins. Action and truth and ascetic penances and profit were made the chords of that car. The Mind became the ground upon which that car stood, and Speech the tracks upon which it was to proceed. Beautiful banners of various hues waved in the air. With lightning and Indra's bow attached to it, that blazing car gave fierce light. That space of time which, on a former occasion, had, in the Sacrifice of the high-souled Ishana, been fixed as a Year, became the bow, and the goddess Savitri became the loud-sounding bow-string. A celestial coat of mail was made, decked with costly gems, and impenetrable and effulgent, sprung from the wheel of Time. That golden mountain, viz., the beautiful Meru, became the flagstaff, and the clouds decked with flashes of lightning became its banners. Thus equipped, that car shone brilliantly like a blazing fire in the midst of the priests officiating at a sacrifice. Beholding that car properly equipped, the gods became filled with wonder.