Aitareyabrahmana 6.28

6.28

He recites the Vālakhilyās.
The Vālakhilyās are indeed the vital breaths; thus he arranges his vital breaths.
He recites them transposed.
These vital breaths are indeed transposed:
out-breath by in-breath, diffused breath by out-breath.
He transposes by pādas in the first hymn,
by half-verses in the second, by verses in the third.
In that he transposes in the first hymn, he transposes out-breath and speech.
In that [he transposes] in the second, he transposes eye and mind.
In that [he transposes] in the third, he transposes ear and the body.
Some transpose the two bṛhatīs together, the two satobṛhatīs together.
Thereby the desire in transposing is attained, but the pragāthas are not arranged.
He should transpose alternately; thus indeed the pragāthas are arranged.
The Vālakhilyās are pragāthas; therefore he should transpose alternately.
As to why alternately:
the bṛhatī is the body; the satobṛhatī is the vital breaths.
He recited the bṛhatī, that is the body; then the satobṛhatī, those are the vital breaths;
then the bṛhatī, then the satobṛhatī; thus he goes encompassing the body with the vital breaths.
Therefore he should transpose alternately.
Moreover, as to why alternately: the bṛhatī is the body; the satobṛhatī is cattle.
He recited the bṛhatī, that is the body; then the satobṛhatī, those are cattle;
then the bṛhatī, then the satobṛhatī; thus he goes encompassing the body with cattle.
Therefore he should transpose alternately.
He inverts the last two hymns; that is their transposition.
Having arranged his vital breaths, the maitrāvaruṇa priest hands him over to the brāhmaṇācchaṃsin priest:
'Do you generate this one.'