vii. 3. 6.

Indra was on a level with the gods, he was not distinguished from them. He ran up to Prajapati; he gave him this (rite) of fifteen nights. He grasped it, and sacrificed with it. Then indeed he became distinguished from the other gods. Those who knowing thus perform (the rite) of fifteen nights attain distinction from the evil enemy. The three days are Jyotis, Go, and Ayus. The Jyotis is this (earth), the Go the atmosphere [1], the Ayus yonder (sky); verily they find support in these worlds. There can be no Sattra where there is no Chandoma; in that there axe Chandomas, there is the Sattra. The gods they win by the Prsthas, the cattle by the Chandomas. The Prsthas are force and strength, the strength, and in cattle, they Chandomas cattle; verily in force and find support. (The rite) is of fifteen nights; the bolt is fifteenfold; verily they hurl the bolt at their enemies. There are Atiratras on either side, for securing power.