Aitareyabrahmana 3.12

3.12

"The divine clans are to be arranged," they say, "[and] metre is to be established in metre."
He calls out at the morning pressing with three syllables: 'śoṃsāvom'.
The adhvaryu responds with five syllables: 'śaṃsāmodaivom'.
That amounts to eight syllables. The gāyatrī has eight syllables.
Thus the two arranged the gāyatrī in front at the morning pressing.
Having recited, he says four syllables: 'ukthaṃ vāci'.
The adhvaryu [says] four syllables: 'om ukthaśā'.
That amounts to eight syllables. The gāyatrī has eight syllables.
Thus the two arranged the gāyatrī on both sides at the morning pressing.
At the midday [pressing] he calls out with six syllables: 'adhvaryo śoṃsāvom'.
The adhvaryu responds with five syllables: 'śaṃsāmodaivom'.
That amounts to eleven syllables.
The triṣṭubh has eleven syllables.
Thus the two arranged the triṣṭubh in front at the midday [pressing].
Having recited, he says seven syllables: 'ukthaṃ vācīndrāya'.
The adhvaryu [says] four syllables: 'om ukthaśā'.
That amounts to eleven syllables.
The triṣṭubh has eleven syllables.
Thus the two arranged the triṣṭubh on both sides at the midday [pressing].
At the third pressing he calls out with seven syllables: 'adhvaryo śośoṃsāvom'.
The adhvaryu responds with five syllables: 'śaṃsāmodaivom'.
That amounts to twelve syllables.
The jagatī has twelve syllables.
Thus the two arranged the jagatī in front at the third pressing.
Having recited, he says eleven syllables: 'ukthaṃ vācīndrāya devebhyaḥ'.
The adhvaryu [says] one syllable: 'om'.
That amounts to twelve syllables.
The jagatī has twelve syllables.
Thus the two arranged the jagatī on both sides at the third pressing.
Seeing this, the ṛṣi declared:
'When the gāyatra [pada] was placed upon the gāyatrī, or when they fashioned the traiṣṭubha [pada] out of the triṣṭubh,
/ or when the jagat pada was placed upon the jagatī—they who know this attain immortality.'
Thus indeed does he establish metre in metre.
He arranges the divine clans, who knows thus.