Agniveshyagrihyasutra 2.4.5

Now therefore, one desiring purification, or about to establish the sacred fires, or about to undertake another great rite [should perform this].

In the bright fortnight under an auspicious asterism, having fasted beforehand, at dawn, having gone out from the village towards the east or the north, having performed bodily purification, having sipped water, having performed the bath as prescribed in rivers or in a pure water reservoir, having returned home, pure, having put on dry white garments, having added fuel to the fire, having performed the ritual like the new moon sacrifice, at the time of the distribution, reciting along: "At the god's [impulse]...", he pours out three handfuls with the formula: "For the troop I pour you out pleasing...", and the fourth silently.

He cooks it with clarified butter.

Having performed [the rites] up to the face of the fire, he should offer with food mixed with ghee.

The verses of Kṣmāpavitra, Sahasrākṣa, the two groups of the Mṛgāra and the Aṃhomuc,

and the Pāvamānī verses, the Kūṣmāṇḍa verses, and the Vaiśvānara verses — he should offer verse by verse.

He should offer the oblations: "This my [prayer], O Varuṇa...", "That of yours, I go to you...", "Deliver us, O Agni...", "So deliver us, O Agni...", "You, O Agni, are the wanderer...", "O Prajāpati...", and "Whatever in this rite I have done in excess...".

The rites from the Jaya offerings up to the giving of the choice cow are established.

Here, having given a gift to the teacher, having performed auspicious rites together with his wives, having gone to a crossroads, having smeared a four-cornered sacrificial ground of the measure of a cow's pasture with cow dung, having set down a vessel, having strewn [grass] around, looking into it as it is filled with water, [he recites] up to the end of the section: "May evil ordain...", "In the lion is my fury...".

Then, taking up the vessel, standing facing the east: "Go away, O evil! Again become one that is lost to us! In the world of the righteous doer, O evil, place us, unharmed! O evil, whoever does not leave us, him indeed do we slay!

Enter elsewhere than into this one, O thousand-eyed, immortal one!

Whoever hates us, may they suffer; whomsoever we hate, him do you slay!" — having placed it behind him, having touched water, he should turn around clockwise.

In this very manner, for seven days, at the three pressings,

He should perform it, keeping silence, eating sacrificial food, with the actions of his senses restrained.

He is freed from all sins, even from a grave sin.

An accumulation of sin done in old age, in youth, or in childhood,

Or born in previous births — from that too he is completely freed.

At the end of feeding the twice-born with milk rice and ghee,

He should cause cows, land, sesame, and gold to be given to those who have eaten.

Having done so, he conquers all worlds, thus said the venerable Āgniveśya.