Jaiminīya (Talavakāra) Brāhmaṇa 2.285

the jagatī twelve syllables, [and] 'vāc' is the finale of the Yajñāyajñīya. That makes thirty-two. The anuṣṭubh has thirty-two syllables. Thus he stated that the anuṣṭubh is all the meters. 'The bṛhatī is cattle': what is the anuṣṭubh, that is the bṛhatī. Placed upon four-footed cattle, it became the bṛhatī. 'Sacrifice': for whoever possesses cattle, to him the sacrifice is accessible. 'The heavenly world': for the bṛhatī indeed is the heavenly world. Now, Saṃgamana Kṣaimi, sent by his teacher Āruṇi, asked Satyayajña Pauluṣi: 'O Satyayajña Pauluṣi, when the gāyatrī has been chanted, the triṣṭubh is being chanted, and the jagatī has not been chanted, how do they all, having united, support the midday pressing?' He did not answer him. Thereby he defeated him. What he should have answered [is]: 'Because the Brahmin and the Vaiśya wait upon the Kṣatriya from below; and because two [pādas] of it became [part of this]; and because it is this twelve-syllable pāda.'

When the meters divided these worlds among themselves, the gāyatrī obtained this world, the triṣṭubh the atmosphere, [and] the jagatī that [world].

[The jagatī obtained] that [world].

The gāyatrī is the priesthood; the triṣṭubh is nobility; the jagatī is the peasantry.

This triṣṭubh could not find delight in this atmosphere, having no proper means of subsistence.

It pierced this gāyatrī facing forward.

It heated it with ascetic heat.

[The gāyatrī] was afraid of it: 'It will take away my abode.'

She said to it: 'Homage to you! Desiring what do you pierce me?'

It said: 'Give me a gift.'

She gave it two eight-syllable pādas.

It crept toward that jagatī.

It pierced it.

It heated it with ascetic heat.

[The jagatī] was afraid of it: 'It will take away my abode.'