Manavashrautasutra 7.2.3

The tenth day is an agniṣṭoma having the twenty-fourfold stoma, during which no dispute may take place.

On it, so that [error] may be averted, they should make circumlocutions with appropriate words.

If they should not be able to do so, the brahman, the master of the house, or the overseers should speak out distinctly.

Whatever two syllables they speak out distinctly, they should announce those to the hotṛ.

He should complete that anuṣṭubh verse indirectly.

At the conclusion of the patnīsaṃyājas, having stepped forward eastward, they attend upon the āhavanīya fire with: / “This one, having a thousand minds, vision, thought of the poets, light, support; / the bright one has impelled the Dawns together; / stainless, attentive, in their dwelling, full of zeal, collected from the cow.”

Having crept into the sadas, they sit down.

Entering the havirdhāna shed, the adhvaryu draws the mental cup.

Having made this [earth] the vessel, [he takes] Vāyu [and] Soma; the drawing and placing with the formula: “You are taken with a support; for Prajāpati [I take] you…” and the bringing near of the stotra [are performed] mentally.

Having chanted on the Sārparājñī verses consecutively, he looks at the hotṛ priest.

To them the adhvaryu priest responds mentally.

He addresses: 'O adhvaryu, let us two speak sacred wisdom.'

'Om, O hotṛ,' [replies] the adhvaryu priest.

Pausing, the hotṛ priest recites the caturhotṛ formulas together with the ṣaḍḍhotṛ formula, and the saptahotṛ formula at the end.

'Om, O hotṛ; so be it, O hotṛ,' [the adhvaryu priest] responds.

Having responded to the caturhotṛ formulas, having said, 'O hotṛ,' he recites Prajāpati as the seventeenth.

Whether the adhvaryu priest [or] the hotṛ priest—those whose adhvaryu priest knows Prajāpati as the seventeenth attached in the sacrifice—those session-sacrificers prosper.

Their sacrifice does not waver; they are firmly established by the sacrifice in Prajāpati.

It is handed down in sacred tradition: 'Call [the gods] to listen!'

This indeed is Prajāpati, the seventeenth attached in the sacrifice.

Whether it departs from the invitatory verse or whether from the offering verse, from that it departs with the deity.

Their sacrifice does not waver; they are firmly established by the sacrifice in Prajāpati.

'Om, O adhvaryu; so be it, O adhvaryu,' he responds.

Having responded, when the recitation is finished, beginning with the taking of the cup up to the consumption, they perform mentally.

The looking is the invitation.

They consume with the jagatī metre.

Having closed the sadas, beginning with 'Here is support, here is self-support,' taking hold of the audumbarī post, they restrain their speech.

Until the sun is above the trees, or until the sight of the stars, not crossing the dhiṣṇya hearths, the two adhvaryu priests take hold of the black antelope skin.

Holding on continuously, going up eastward,

'You two, Indra and Parvata, as forefront fighters, / whoever would battle against us, strike that very one down, / with the vajra strike that very one down!

Let him hide far away who is driven off, / when he attains the abyss.

Around our enemies from every side, O hero, / let the shatterer tear from every side!'

—with [these verses] they attend upon the āgnīdhrīya hearth.

On two [hearths] they place fuel sticks and choose boons.

The concluding atirātra is explained by the introductory one.

It is concluded as established.

At the time of shaving, they have [their hair] shaved together with the tufts.

The udavasānīyā offering is [performed] separately.