Jaiminīya (Talavakāra) Brāhmaṇa 1.206

1.206

yāni chandāṃsyaharvahanti tāni rātriṃ vahanti
eṣā gāyatryeṣā virāḍeṣā kakubeṣānuṣṭup
bṛhatīṣu stuvanti
tena bṛhatībhyo na yanti
tāsāṃ yaddvādaśāksarāṇi padāni tena jagatībhyo na yanti
triṣṭubhā vaṣaṭkaroti
tena triṣṭubbhyo na yanti
tānsaṃdhinābhipalāyanta āśvinenāsaṃheyamagamayan
asaṃheyaṃ ha vai dviṣantaṃ bhrātṛvyaṃ gamayati ya evaṃ veda
eṣā vā agniṣṭomasya saṃmā yadrātriḥ
dvādaśa vā agniṣṭomasya stotrāṇi dvādaśa rātreḥ
eṣā vā ukthasya saṃmā yadrātriḥ
trīṇyukthāni tridevatyaḥ saṃdhiḥ
eṣā vā agniṣṭomasya ca saṃvatsarasya ca saṃmā yadrātriḥ
dvādaśa vā agniṣṭomasya stotrāṇi dvādaśa māsāḥ saṃvatsaraḥ
rātryā tvāva trayodaśo māsa āpyate
eṣā vai bradhnasya viṣṭapaṃ yadrātriḥ
gacchati bradhnasya viṣṭapaṃ ya evaṃ veda

The meters that carry the day, they carry the night.
This is the gāyatrī, this the virāj, this the kakubh, this the anuṣṭubh.
They chant in bṛhatī verses.
Thereby they do not deviate from the bṛhatīs.
In that their quarters have twelve syllables, thereby they do not deviate from the jagatīs.
He pronounces the vaṣaṭ-call with a triṣṭubh.
Thereby they do not deviate from the triṣṭubhs.
To them fleeing toward the twilight round, they made them go to an irrecoverable state through the Āśvina [stotra].
He indeed drives his hateful rival to an irrecoverable state, who knows thus.
This night is the measure of the Agniṣṭoma.
There are twelve stotras of the Agniṣṭoma; twelve of the night.
This night is the measure of the Ukthya.
There are three ukthas; the twilight round belongs to three deities.
This night is the measure of the Agniṣṭoma and of the year.
There are twelve stotras of the Agniṣṭoma; twelve months are the year.
By the night indeed the thirteenth month is obtained.
This night is the summit of the sun.
He goes to the summit of the sun, who knows thus.