YV 6.7e

In that on one post he twines round two girdles, therefore one man wins two wives; in that he does not wind one girdle round two posts, therefore one wife does not find two husbands. If he desire of a man, 'Be a girl born to him', he should intertwine (the girdles) near the ends; verily a girl is born to him; if he desire of a man, 'Be a son born to him', he should cover it round right up to the end; verily a son is born to him [3]. The Asuras drove the gods to the south, the gods repelled them by the Upaçaya (post); that is why the Upaçaya has its name. In that the Upaçaya lies near (upaçáye) on the south, (it serves) to drive away the foe. All the other posts have victims (attached), the Upaçaya has none, its victim is the sacrificer; if he were not to indicate (a victim), the sacrificer would be ruined. 'N.N. is thy victim', (with these words) he should indicate whomsoever he hates; whom he hates [4], him he indicates as a victim to it. If he hates not, 'The mole is thy victim', he should say; he harms not domestic nor wild animals. Prajapati created offspring; he was destitute of proper food, he saw this set of eleven, and therewith he won proper food. In that there are ten posts, the Viraj has ten syllables, and the Viraj is food, he wins proper food by the Viraj [5]; thereby he milks the eleventh breast of her. In that the set of eleven (is set up), a thunderbolt is set up; it is liable to crush the sacrifice face to face; in that he sets up (the stake) (for Tvastr) with the wives, (it serves) to establish the sacrifice and to bind. Prajapati created offspring; he thought himself emptied, he saw this set of eleven (victims), with it he bestowed life, power, and strength upon himself; he who sacrifices creates as it were offspring; then he is as it were emptied; in that this set of eleven is (offered), with it the sacrificer bestows life, power, and strength upon himself.