YV 2.7c

Then indeed did he become resplendent. He, who knowing thus sacrifices with (the rite) of eight nights, becomes resplendent. (The rite) is of eight nights; the quarters are four, the intermediate quarters four; verily from the quarters he wins splendour [1]. There is an Agnistoma with the Trivrt (Stoma); verily he wins brilliance. There is a Pañcadaça (Stoma); verily he wins power. There is a Saptadaça (Stoma), for the winning of food; verily also by it he is propagated. There is an Ekavinça (Stoma), for support verily he places radiance in himself. There is a Trinava (Stoma), for conquest. There is a Trayastrinça (Stoma), for support. There is an Agnistoma with the Pañcadaça (Stoma), to obtain Prajapati; it has (the characteristics of) the Mahavrata, to win food. There is a Viçvajit Atiratra with all the Prsthas, to conquer all. Prajapati created offspring. They being created were ahungered. He saw this (rite) of nine nights, he grasped it, and sacrificed with it. Then indeed was he able to help offspring, When offspring are ahungered, one should sacrifice with (the rite) of nine nights, for these worlds are not fitted for them, and thus they are ahungered; verily he makes these worlds fitted for them, and as they become fitted he becomes fit for offspring along with them; these worlds become fit for him [1], and strength he places in offspring. By means of three nights he makes fit this world, by means of three nights the atmosphere, by means of three nights yonder world. As a man casts thread on thread, so he casts world on world, for firmness, and to avoid looseness. The Stomas are known as Jyotis, Go, and Ayus. The Jyotis is this (earth), the Go the atmosphere, the Ayus yonder (sky); verily they find support in these worlds, and he becomes famous among people [2]. (The rite) is of nine nights; verily in order he places brilliance on him.