Jaiminīya (Talavakāra) Brāhmaṇa 2-3.138

Just as one would sprinkle with water what is burned by fire, exactly like that is it for appeasement.
About that they say: 'Whoever sprinkles with water what is burned by fire, it either flakes away more or turns into white leprosy.'
It should be performed on those very verses containing [the name of] Vāyu: 'O Vāyu, come with favorable thoughts to our sacrifice reaching to heaven.'
Vāyu indeed is appeasement; [it is] for appeasement, for non-burning.
About that they say: 'Whoever, having kindled fires, fans them with wind, it blazes up even more;
this is indeed blazing.'
And about that they say: 'The sacrificer should indeed desire that he blaze up.
In so far as it is for blazing, Vāyu is indeed for blazing;
in so far as it is for appeasement, Vāyu is indeed for appeasement.
Therefore it should be performed on these very verses containing [the name of] Vāyu.'
His sacrificial fee is both a she-goat and gold.
The she-goat belongs to Agni; gold belongs to Agni.
Moreover, they say an ox is the sacrificial fee.
An ox indeed conveys [the load]; Agni conveys the sacrificial offering to the gods.
Thereby they make the stoma prosperous with its characteristic mark.

Now this is the Indrastoma.

Indra desired: 'May I attain supremacy over all the gods.'

He saw this sacrifice.

He brought it forth.

He sacrificed with it.

Then indeed he attained supremacy over all the gods.

He who knows thus attains supremacy among his own people.