Jaiminīya (Talavakāra) Brāhmaṇa 17.79

17.79

tadāhuratāmyannevopeyāt
yadā vai tāmyatyatha mriyate
tasmādatāmyannevopeyāditi
devā vai svargakāmāstapo'tapyanta
ta etatsāmāpaśyan
tenāstuvata
tadenānsāda eva bhūtvā svargaṃ lokamavahat
te'bruvanneti vai sāda iti
yadabruvanneti vai sāda iti | tadetīṣādīyasyetīṣādīyatvam
ta u svargaṃ lokaṃ gatvābruvannāta iva bata svarge loke sadāmeti
tadvevātīṣādīyasyātīṣādīyatvam
tadetatsvargyaṃ sāma
aśnute svargaṃ lokaṃ ya evaṃ veda
athaitā bhavanti
purojitī vo andhasa
iti virājo'nuṣṭubho vairāje'han | virāja evānnādyasyāvaruddhyai
atho yathānyau navatarau cakrāvupāsyed | evamevaitāmanuṣṭubhaṃ tryahamukheṣu
paryāharanti svargasya lokasya samaṣṭyai

Regarding this they say: 'One should approach [the finale] without panting.
For when one pants, then one dies.
Therefore one should approach [it] without panting.'
The gods, desiring the heavenly world, performed ascetic heat.
They saw this sāman.
With it they chanted praise.
Becoming a seat, it conveyed them to the heavenly world.
They said: 'Truly, this seat has come!'
Because they said: 'Truly, this seat has come!' (iti vā etaḥ sādaḥ), that is the nature of the Itīṣādīya.
And when they had reached the heavenly world, they said: 'Ah, we sit as if having arrived in the heavenly world!'
That very fact is the nature of the Ātīṣādīya.
This sāman brings about heaven.
He who knows this attains the heavenly world.
Then there are these [verses]:
'Advancing ahead to your food...'
which are Virāj verses [in form of] Anuṣṭubhs on the Vairāja day, to secure Virāj and food.
And just as one might attach two newer wheels, even so they bring around this Anuṣṭubh at the beginning of each three-day period to attain the heavenly world.