Śāṅkhāyana (Kauṣītaki) Āraṇyaka 8.8

8.8

ŚĀ 8,8
pṛthivyā rūpaṃ sparśā antarikṣasyoṣmāṇo divaḥ svarāḥ | agne rūpaṃ sparśā vāyor ūṣmāṇa ādityasya svarāḥ | ṛgvedasya rūpaṃ sparśā yajurvedasyoṣmāṇaḥ sāmavedasya svarāḥ | rathantarasya rūpaṃ sparśā vāmadevyasyoṣmāṇo bṛhataḥ svarāḥ | prāṇasya rūpaṃ sparśā apānasyoṣmāṇo manasaḥ svarāḥ | prāṇasya rūpaṃ sparśā apānasyoṣmāṇa udānasya svarāḥ svarā iti punardattaḥ | eṣa u haiva sarvāṃ vācaṃ veda ya evaṃ veda ||

The stop-consonants are the form of earth, the sibilants of the intermediate space, the vowels of heaven. The stop-consonants are the form of Agni, the sibilants of Vāyu, the vowels of the Sun. The stop-consonants are the form of the Ṛgveda, the sibilants of the Yajurveda, the vowels of the Sāmaveda. The stop-consonants are the form of the Rathantara [sāman], the sibilants of the Vāmadevya, the vowels of the Bṛhat. The stop-consonants are the form of the in-breath, the sibilants of the out-breath, the vowels of the mind. The stop-consonants are the form of the in-breath, the sibilants of the out-breath, the vowels of the up-breath: 'the vowels,' thus [taught] Punardatta. He indeed knows all speech who knows thus.