Fire अग्निः

O Fire, lead us by the good path for the enjoyment of the fruit of our action. You know, O god, all our deeds. Destroy our sin of deceit. We offer, by words, our salutations to you.

Yajur Veda, Isa Upanishad, Part 1, Chapter 1, 18

Om, verily, the head of the sacrificial horse is the dawn, its eye the sun, its vital breath the wind, its open mouth the Vaisvanara fire and the trunk of the sacrificial horse is the year. The back is heaven, the belly the intermediate region, the hoofthe earth, the sides the four quarters, the ribs the intermediate quarters, the limbs the seasons, the joints the months and half-months, the feet the days and nights, the bones the stars, the flesh the clouds. Its half-digested food is the sand, the blood-vessels the rivers, the liver and lungs the mountains, the hair the herbs and trees. The fore part of the horse is the rising sun and the hinder part the setting sun. Its yawn is lightning, its shaking of the body is thunder, its water is rain and its neighing is indeed voice.

Yajur Veda, Brihadaranyaka Upanishad I, I-Meditation on the Horse-sacrifice, 1

The day, verily, is the golden cup called mahiman, in front of the horse, which arose pointing it out. Its source is the eastern sea. The night, verily, is the silver cup called mahiman, behind the horse, which arose pointing it out. Its source is the western sea. These two vessels appeared at either end of the horse. As a racer the horse carried the gods; as a stallion, the gandharvas; as a runner, the demons; as a horse, men. The sea is its stable and the sea, its source.

Yajur Veda, Brihadaranyaka Upanishad I, I-Meditation on the Horse-sacrifice, 2

In the beginning there was nothing whatsoever in the universe. By Death, indeed, all this was covered-by hunger, for hunger is, verily, death. Let Me have a mind, was His desire and He created the mind. Then He moved about, worshipping Himself. From Him, thus worshipping, water was produced. Verily, Death though, while I was worshipping, water was produced; that is why the Arka (fire used in the Horse-sacrifice) is so called. Surely, happiness comes to him who knows how the fire came to be calledarka.

Yajur Veda, Brihadaranyaka Upanishad I, II-The Process of Creation, 1

Water, verily, is arka. What was then like froth on the water became solidified; that was earth. After the earth was created, Hiranyagarbha was tired. From Him, thus fatigued and heated, came forth His essence as brightness. That was Fire.

Yajur Veda, Brihadaranyaka Upanishad I, II-The Process of Creation, 2