Kauṣītaki (Śāṅkhāyana) Brāhmaṇa 6.5.2

6.5.2

tad āhur yad ṛcā hotā hotā bhavati yajuṣā adhvaryur adhvaryuḥ sāmnā udgātā udgātā kena brahmā brahmā bhavati iti / (Zūlagava: brahmatva)

vi. 11. They say ‘Since it is by the Ṛc that the Hotṛ becomes Hotṛ, by the Yajus that the Adhvaryu becomes Adhvaryu, by the Sāman that the Udgātṛ becomes Udgātṛ, by what does the Brahman become Brahman?’ That sap of brilliance which he developed from the threefold lore, by that the Brahman becomes Brahman. They say ‘What should he know and what his metre whom he should choose as Brahman?’ ‘An Adhvaryu’, some say, ‘he knows the places for moving about.’ ‘A Chandoga,’ some say, ‘so are his Haviryajñas performed with the three Vedas.’ ‘A Bahvṛca’ is however the rule, ‘The other two Vedas are attendants of that (the