YV 2.6h

Milk (is the drink) of the Brahman, the Brahman is brilliance, milk is brilliance; verily by brilliance he endows himself with brilliance and milk. Again by milk foetuses grow; the man who is consecrated is as it were a foetus; in that milk is his drink, verily thus he causes himself to grow. Manu was wont thrice to take drink, the Asuras twice, the gods once [3]. Morning, midday, evening, were the times of Manu's drinking, the symbol of the sacrifice of cooked food, (serving) for prosperity. Morning and evening were those of the Asuras, without a middle, a symbol of hunger; thence were they overcome. Midday and midnight were those of the gods; thence they prospered and went to the world of heaven. Now with regard to his drinking at midday and at midnight, it is in the middle that people feed themselves; verily he places strength in the middle of himself, for the overcoming of his foes. He prospers himself [4], his foe is overcome. Now the man who is consecrated is a foetus, the consecration-shed is the womb (in which he is). If the man who is consecrated were to leave the consecration-shed, it would be as when a foetus falls from the womb. He must not leave, to guard himself. The fire here is a tiger to guard the house. Therefore if the man who is consecrated were to leave (the shed), he would be likely to spring up and slay him. He must not leave, to protect himself. He lies on the right side; that is the abode of the sacrifice; verily he lies in his own abode. He lies turned towards the fire; verily he lies turned towards the gods and the sacrifice. On a place of sacrifice where the sacrifice faces the east should he make him to sacrifice for whom he wishes, 'May the higher sacrifice condescend to him, may he gain the world of heaven.' That is the place of sacrifice where the sacrifice faces the east, where the Hotr as be recites the Prataranuvaka gazes upon the fire, water, and the sun. To him the higher sacrifice condescends, he gains the world of heaven.