Kaushitakagrihyasutra 3.15: atha pañcadaśaḥ khaṇḍaḥ

After the full moon day of the month of Mārgaśīrṣa, there are three Aṣṭakā festivals on the eighth days of the waning fortnights.

At the first of them, he offers vegetables, with: 'This is that very one who shone forth first; entering, she moves within this [world]. Having become a mother, the bride has given birth to the new one; let three mighty ones attend her, svāhā!'

Then [the oblations] of the Sviṣṭakṛt, with: 'In whom Yama, the son of Vivasvat, and all the gods are concentrated—the Aṣṭakā facing all directions, she has satisfied my desires. The pressing-stones, they say, are your teeth, the clarifying [Soma] your udder; the half-months and months are your limbs; homage to you, O fair-faced one, svāhā!'

At the middle one, on the full moon day of Māgha or in the rainy season, he offers the four great mystical utterances. Having recited the four [verses beginning with]: 'Those who were thirsty', he should offer the omentum, with: 'Carry the omentum, O Jātavedas, to the fathers where you know them in the world of good deeds! May streams of fat flow forth, reaching them; may the desires of the sacrificer be true, svāhā!' With the four great mystical utterances and with the four [verses beginning with]: 'Those who were thirsty', [he makes] eight oblations, the boiled sacrificial mess mixed with the portions cut off [from the victim].

'The mountains are hidden, the great earth is hidden; from the day and from all the quarters I conceal another from the fathers, for so-and-so, svāhā! The seasons are hidden, well-joined day and night; the half-months and the months are limbs; homage to you, O fair-faced one, svāhā! Those [waters] that stand, those that flow, those that stand around with water—with the waters, the supporters of all, I place [myself] elsewhere than the father, for so-and-so, svāhā! In that my mother went astray, unfaithful to her husband—may my father take that seed; let another fall away, they say, for so-and-so, svāhā!'—[these are] four [verses] in place of the great mystical utterances in case of performing it elsewhere.

At the last [Aṣṭakā], he offers cakes, with: 'The Ukthya, the Atirātra, and the Sadyaskrī together with metre, and other sacrifices, the gods, the seers, and likewise the fathers, the seasons, the animals and beings—may they always be auspicious and peaceful to me; let them be my [blessings] produced by the cake, at the Aṣṭakā, all united; homage to you, O fair-faced one, svāhā!' The Sviṣṭakṛt is the same.

On the next day, at the Anvaṣṭakya rite, according to the procedure of the Piṇḍapitṛyajña, [there is an offering of] a cow, or a goat, or a boiled sacrificial mess; or he should bring a mouthful of grass for a cow, or he may even burn a bush, [saying]: 'This is my Aṣṭakā.'

He should certainly not fail to perform it; he should certainly not fail to perform it.

Thus ends the third chapter in the Kauṣītakagṛhyasūtra.