Jaiminīya (Talavakāra) Brāhmaṇa 2-8.310

They sought to harm him. He reflected: 'How now might I slay seven of their domestic cattle each day?' He saw these two sacrifices. He brought them; he sacrificed with them. Then indeed he slew seven of their domestic cattle each day. This is that unbreached thunderbolt. With this unbreached thunderbolt he hurled [destruction] against them. Just as one might crush sesame seeds with a wooden pestle, so indeed dawn broke upon them, crushed and unburied. He who has a rival, who performs black magic, who contends, should sacrifice with these two. With this unbreached thunderbolt he slays the hateful, evil rival. And they also say: 'One who desires offspring should sacrifice with these two.' The stoma is here linked to the stoma; from a linked pair, offspring and cattle are born, verily for propagation. Then this seventh day becomes seventeen-fold. On it they approach the Mahāvrata. Prajāpati is seventeen-fold; food is the Mahāvrata; they provide Prajāpati with food in his own domain.

Now these eight-night rites.

Bṛhaspati desired: 'May I be brilliant, endowed with spiritual luster, may I attain fame among the gods.'

He saw this eight-night sacrifice.

He brought it.

He sacrificed with it.

Then indeed he became brilliant, endowed with spiritual luster, and attained fame among the gods.

For he attained fame when he obtained the office of domestic priest among them.

He becomes brilliant, endowed with spiritual luster, and attains fame among the gods, who knows thus.

And they also say: 'One who desires a full life-span should sacrifice with this.'

The Gāyatrī is breath.

This sacrifice has conformed to the Gāyatrī.

Therefore indeed one who desires a full life-span should sacrifice with this.

And they also say: 'One who desires cattle should sacrifice with this.'

The Gāyatrī has eight syllables.