Jaiminīya (Talavakāra) Brāhmaṇa 1.131

Fivefold is the sacrifice; fivefold are cattle.
He thus finds a firm standing in the sacrifice and in cattle.
He chants six stobha-syllables.
Six indeed are the seasons.
He thus finds a firm standing in the seasons.
Moreover, six indeed are the meters.
He thereby obtains them.
He chants seven stobha-syllables.
Seven-footed indeed are the Śakvarī [verses].
Cattle belong to the Śakvarī meter.
He thus finds a firm standing in cattle, in the Śakvarī meter.
Moreover, seven are the meters increasing by four syllables; seven are the vital breaths in the head.
He thereby obtains them.
He chants eight stobha-syllables.
Eight-syllabled indeed is the Gāyatrī.
The Gāyatrī is brilliance, spiritual luster.
He thus finds a firm standing in brilliance and spiritual luster.
Moreover, [he stands] among eight-hoofed cattle.

He chants nine stobha-syllables.

Nine indeed are the breaths in man.

He thereby deprives the rival enemy of his breaths.

He places the breaths in himself.

Moreover, he obtains the praise-song of the threefold stoma.

He chants ten stobha-syllables.

Ten-syllabled is the Virāj; food is the Virāj.

He thus finds a firm standing in the Virāj, in food.

Moreover, ten are the breaths.

He thereby obtains them.

He chants eleven stobha-syllables.

Eleven-syllabled is the Triṣṭubh.

Faculty and vital power are the Triṣṭubh.

He thus finds a firm standing in faculty and vital power.

He chants twelve stobha-syllables.

Twelve-syllabled indeed is the Jagatī.

Cattle are the Jagatī.