YV 2.5k

In silence he puts (them) down, for he should not obtain them with a Yajus; the Karsmarya on the south, the Udumbara on the north; therefore is yonder (sky) higher than this (earth); the Karsmarya filled with butter, the butter is a thunderbolt, the Karsmarya is a thunderbolt; verily by the thunderbolt he smites away the Raksases from the south of the sacrifice; the Udumbara filled with curds, curds are cattle, the Udumbara is strength; verily he confers strength upon cattle. He puts (them) down filled; verily filled they wait on him [4] in yonder world. 'In the Viraj should the fire be piled', they say; the Viraj is the ladle; in that he puts down two ladles, he piles Agni in the Viraj. As each beginning of the sacrifice is being performed, the Raksases seek to destroy the sacrifice; the golden disk is a beginning of the sacrifice; in that he pours butter over the gold disk, he smites away the Raksases from the beginning of the sacrifice. With five (verses) he pours butter; the sacrifice is fivefold; verily he smites away the Raksases from the whole extent of the sacrifice; he pours butter transversely; therefore animals move their limbs transversely, for support. He puts down the naturally perforated brick; the naturally perforated brick is this (earth); verily he puts down the (earth). He makes the horse sniff it; verily he bestows breath upon it; now the horse is connected with Prajapati; verily he piles the fire with Prajapati. The first brick that is put down obstructs the breath of cattle and of the sacrificer; it is a naturally perforated one, to permit the breath to pass, and also to reveal the world of heaven. 'In the fire must the fire be piled', they say; the Brahman [1] is Agni Vaiçvanara, and to him should he hand over the first brick over which a Yajus has been recited; with the Brahman he should deposit it; verily in the fire he piles the fire. Now he who ignorantly puts down a brick is liable to experience misfortune.