Jaiminīya (Talavakāra) Brāhmaṇa 2-8.324

Indra, having hurled the thunderbolt at Vṛtra, thinking, 'I have not slain [him],' was terrified.
Turned pale and terrified, he grew frail.
He considered: 'How indeed may I pass beyond the tenth [day] of this pallor, of evil?'
He saw this ten-day sacrifice.
He brought it;
with it he sacrificed.
Then indeed he passed beyond the tenth [day] of that pallor, of evil.
He passes beyond the tenth [day] of pallor, of evil, who knows thus.
Therefore also they ask of one wounded, or of a woman who has given birth, or of one who has been sick: 'Has he passed the tenth day?'
Then indeed they pass beyond the tenth [day] of that pallor, of evil.
He passes beyond the tenth [day] of pallor, of evil, who knows thus.

Now this [rite] is the Trikakup.

One desiring procreation should sacrifice with it.

The Trivṛt and Pañcadaśa are the two stomas.

Deficient and redundant, they are a pair, productive.

One is deficient, the other is redundant.

From a pair that is deficient and redundant, indeed, offspring and cattle are born.

With the two they surround the Trivṛt stoma.

Those two generate that very [stoma].

The Saptadaśa and Ekaviṃśa are the two stomas.

Deficient and redundant, they are a pair, productive.

One is deficient, the other is redundant.

From a pair that is deficient and redundant, indeed, offspring and cattle are born.

With the two they surround the Saptadaśa stoma.

Those two generate that very [stoma].

The Triṇava and Trayastriṃśa are the two stomas.

Deficient and redundant, they are a pair, productive.

One is deficient, the other is redundant.