Agniveshyagrihyasutra 2.7.7

I shall declare the Brahmakūrca, the supreme purifier of the body,

for an offering beginning with the Veda or a Jaya offering performed without mantras and unconsecrated,

and upon eating the food of a Śūdra, and in cases of selling the Vedas,

and when licked by a crow or a dog, or afflicted by wild beasts and birds.

In the case of contact with an outcaste or a foreigner, the five products of the cow is the purifier.

One should take cow's urine from a dark-blue-coloured [cow], and cow dung from a black [cow];

and milk from a copper-coloured [cow], and curd from a white [cow];

ghee should be taken from a tawny [cow]—it destroys great sins.

In the absence of all [these] colours, it may be taken from a single tawny [cow].

One should give one pala of cow's urine, and cow dung of the size of half a thumb;

one should give seven palas of milk, and three palas of curd;

one should give one pala of ghee, and likewise kuśa water.

The cow's urine is to be taken with the Sāvitrī verse; the cow dung with "Gandhadvārām …";

and the milk with "Āpyāyasva …"; the curd indeed with "Dadhikrāvṇo …";

the clarified butter with "Śukram asi …"; the kuśa water with "Devasya tvā …";

having stirred it with "Āpo hi ṣṭhā mayobhuvaḥ …",

[and]

having consecrated it with "Mā nas toke …",

having scooped it up with the sacred syllable Om, having churned it with the sacred syllable Om, one should drink it indeed with the sacred syllable Om.

To Agni,

to Soma,

with "Irāvatī …",

with "Idaṃ viṣṇur vicakrame …",

with "Mā nas toke …",

with "Prajāpate …",

and having offered with the Gāyatrī, one should drink it with a middle palāśa leaf or with a lotus leaf.

"Whatever sin has entered the skin and bones, and resides in my body,

all [that] the water of the Brahmakūrca burns, as fire burns firewood."

Thus [ends the seventh section].