YV 7.6j

Moreover Agni Vaiçvanara is this (earth); in that [3] he piles with clay, therefore is it called the fire. d He puts down golden bricks; gold is light; verily be confers light upon him; again gold is brilliance; verily he confers radiance upon himself. He, who piles (the fire) with faces on all sides, eats food in all his offspring, conquers all the quarters. In the east he puts down a Gayatri, a Tristubh on the south, a Jagati on the west, an Anustubh on the north, a Pankti in the middle; this is the fire with faces on all sides: he, who knowing thus piles it, eats food in all his offspring, conquers all the quarters; verily also he weaves quarter in quarter; therefore quarter is woven in quarter. Prajapati created the fire; it created ran away east from him; he cast the horse at it, it turned to the south; he cast the ram at it, it turned to the west; he cast the bull at it, it turned to the north; he cast the goat at it, it ran upwards. He cast the man at it. In that he puts down the heads of animals, he piles it [1], winning it on every side. The heads of animals are bricks, breath supporting, full of sight; in that he puts down the heads of animals, the sacrificer breathes with them in yonder world; verily also these worlds shine forth for him by them. He puts them down after smearing with mud, for purity. The fire is an animal, animals are food, the heads of animals are this fire; if he desire of a man, 'May his food be less' [2], he should put down for him the heads of animals more closely together; his food becomes less; if he desire of a man, 'May his food be similar (to what he has now)', he should put them down for him at a mean distance; verily his food becomes the same; if he desire of a man, 'May his food become more', he should put them down separating them at the ends of the pile; verily at the ends also he wins food for him; his food becomes more.