ii. 3. 6.

Prajapati assigned food to the gods; he said, 'Whatever shall be left over these worlds, be that mine.' That was left over these worlds, Indra, the king, Indra, the overlord, Indra, the sovereign; thence he milked these worlds threefold; that is the cause of its having three elements. For him of whom he desires, 'May he be an eater of food', let him offer this (offering) of three elements, to Indra, the king, a cake [1] on eleven potsherds, to Indra, the overlord, to Indra, the sovereign. Indra, the king, is this (world of earth), Indra, the overlord, is this (atmosphere), Indra, the sovereign, is yonder (world of heaven); verily he has recourse to these worlds with their own share; verily they bestow food on him; he becomes an eater of food. Even as one milks a cow ready to give milk by reason of its calf, so he milks these worlds, made ready, for desire, for food; he places (the cake) on potsherds face upwards, for variety. There are three cakes, these worlds are three; (verily they serve) to obtain these worlds; each one above the other is larger, for so as it were are these worlds; (verily they serve) for prosperity; he cuts off from all (the cakes) as he sets them up without making a failure; be recites (the verses) alternating, to prevent burning.