YV 3.7h

In that the Prsthas are reversed they descend to this world with them; verily also they find support in this world, for sanity. Indra was unsettled. He ran up to Prajapati; he gave him this (rite) of twenty-one nights; he grasped it, and sacrificed with it. Then indeed he became settled. Those, who sacrifice much and are unsettled [41, should perform (the rite) of twenty-one nights. There are twelve months, five seasons, three worlds here, and yonder sun as the twenty-first. So many are the worlds of the gods; verily in them in order they find support. Yonder sun did not shine. He ran up to Prajapati; he gave him this (rite) of twenty-one nights; he grasped it, and sacrificed with it. Then in deed did he shine. Those, who knowing thus perform (the rite) of twenty one nights, shine also. (The rite) is of twenty-one nights, the Ekavinça (Stoma) is radiance; verily they attain radiance, and support also, for the Ekavinça is support. There are Atiratras on either side, for securing splendour. The Horse Sacrifice (continued) vii. 3. 11. a Let the sacrifice come forward From yonder over to me, The sacrifice which the Rsis have brought forward. b May the fault in the sacrifice settle on him who hateth us, Making his body godless, strengthless, Distorted and inert; May it rest with him who hateth us. c O sacrifice, come to me With the brilliance of the sacrifice. I summon the Brahmans, the priests, the gods, With the brilliance of thee, the sacrifice, O offering. d With the sacrifice I summon the cooked food [1] to thee, O offering. I gather for thee good deeds, offspring, and cattle. e The Praisas, the kindling-(verses), the butter sprinklings, the shares of the ghee, The call, the reply, I prepare for thee, The fore- and after-sacrifices, the Svisakrt, the Ida. The prayers, I win, the light. f By Agni, by Indra, by Soma, By Sarasvati, by Visnu, by the gods, By the Yajya and the Anuvakya, I summon for thee, O offering. I take for thee the sacrifice with the Vasat cry.