Jaiminīya (Talavakāra) Brāhmaṇa 1.37

1.37

Then indeed brahman did not shine, having no protector, having no final recourse, having nothing higher.
Then brahman offered that fire-offering for twelve days.
Having offered it for twelve days, it extracted fame, glory, procreation, and immortality.
Having offered that fire-offering for twelve days, brahman, passing it on to Prajāpati, departed upwards to the heavenly world.
Prajāpati offered that fire-offering for twelve days.
Having offered it for twelve days, he extracted insight, intelligence, reflection, and ascetic heat.
Having offered that fire-offering for twelve days, Prajāpati, passing it on to the gods and the seers, departed upwards to the heavenly world itself.
The gods and the seers offered that fire-offering for twelve days.
Having offered it for twelve days, passing it on to the earlier men, they departed upwards to the heavenly world itself.
Brahman indeed offered that fire-offering for twelve days,
Prajāpati for twelve days, the gods and seers for twelve days.
Having offered it for twelve days each, they obtained their desires, whatever they desired.
How much more, then, he who should offer it thus as long as he lives!