Jaiminīya (Talavakāra) Brāhmaṇa 1.231

Regarding this, they say: 'Since other sacrificial rites have pavamāna [lauds], by what does their night become possessed of a pavamāna?' / He should say: 'By the rathantara-saṃdhi [laud].' / Through this, indeed, the night becomes possessed of a pavamāna. / With it, having uttered the sound 'hiṃ' once, they praise straight on. / For they utter 'hiṃ' in front once for the trivṛt [stoma], so that the beginning may be the conclusion. / The former trivṛt is the pouring of semen; Prajāpati is the latter. / The self, offspring, and cattle are these triplets [of verses]. / Prajāpati is the rathantara. / If they were to praise with [only] a single utterance of 'hiṃ', that would be just as if semen were poured and did not reproduce. / That they utter 'hiṃ' for each triplet is solely for procreation. / He who knows thus becomes manifold and is procreated. / Moreover, if they were to praise with [only] a single utterance of 'hiṃ', only one round of theirs would have an abode, and two would lack an abode. / That they utter 'hiṃ' for each triplet—by that very fact their entire night becomes possessed of an abode and possessed of a pavamāna. / As is the day, so is the night; as is the night, so is the day. / Morning, midday, afternoon; early night, midnight, late night. / That they utter 'hiṃ' for each triplet is precisely for the distinct maintenance of day and night.

Regarding this, they say: 'Since all sacrificial rites are completed according to the twenty-one-fold [stoma], and the ukthas go beyond the twenty-one-fold,

the night goes [further]. Then by what does their night conclude according to the twenty-one-fold?'

He should say: 'Because these become twenty-one trivṛts and nine twenty-one-folds.'

Now Bhāllaveya used to say: 'Who indeed today will sacrifice with a sacrificial rite that has light at both ends?'