Agniveshyagrihyasutra 1.2.1

In the fortnight of the Śravaṇā [constellation], when the herbs have sprung up, under the constellation Hasta, or on the full-moon day, [takes place] the opening of the study [of the Veda].

Having established the fire and performed [the rites] up to the mystic utterances, he makes offerings to the five section-seers: 'To Prajāpati, the section-seer, svāhā;'

'To Soma, the section-seer, svāhā;'

'To Agni, the section-seer, svāhā;'

'To the All-gods, the section-seers, svāhā;'

'To the Self-existent, the section-seer, svāhā.'

Or, having offered to the names of the sections, to the Sāvitrī, the Ṛgveda, the Yajurveda, the Sāmaveda, the Atharvaveda, and the Lord of the Assembly, they say that, after waiting for three days or one day, one should study according to the [traditional] study.

Now then, the sections are stated: The Puroḍāśa, the Yājamāna, the Hotṛ, the Hautra, the Pitṛmedha—[these], together with their Brāhmaṇas and supplementary Brāhmaṇas, belong to Prajāpati.

The Adhvaryu section, the offerings for sacrificial gifts of cups, the Samiṣṭayajus formulas, the Avabhṛthayajus formulas, the Vājapeya, the Śukriya sections, the Savas—[these], together with their Brāhmaṇas and supplementary Brāhmaṇas, belong to Soma.

The Agnyādheya, the Punarādheya, the Agnihotra, the Agnyupasthāna, the Sāvitra, the Nāciketa, the Cāturhotrīya, the Vaiśvasṛja, the Āruṇaketuka, the Āgnika—[these], together with their Brāhmaṇas and supplementary Brāhmaṇas, belong to Agni.

The Rājasūya, the animal sacrifices, the seasonal offerings or constellation offerings, the Divaśśyenī, the Apāgha, the Sātrāyaṇa, the secondary offerings, the hymns, the Aupānuvākya, the Yājyā, the Aśvamedha, the Puruṣamedha, the Sautrāmaṇī, the Acchidra, the animal Hautra, the Upaniṣads—[these], together with their Brāhmaṇas and supplementary Brāhmaṇas, belong to the All-gods.

The rule relating to the Self-existent is recited in his own section, and the deity here is the Self-existent, the Lord of all beings.

Now [concerning] the Kārīrī vow: for four nights he should eat food free of pungent herbs and salt, without pulses, on the ground, like an animal.

Now for the Kārīrī [rites]: studying the section on the herbs beginning with the Maruts, 'the gods whose wealth is...', 'O Agni, the Maruts...', 'the gods offering shelter...', he should not eat here like an animal.

Now [concerning] the vow for the Kārīrī: beginning with 'Harnessing first,' studying the section on the herbs first, he should not eat here on the ground like an animal; or if he is studying the step-by-step recitation. || 1