Jaiminīya (Talavakāra) Brāhmaṇa 2-8.439

2-8.439

athaite jyotirgaurāyuriti stomā bhavanti
gaurāyuraskandat
tato jyotirajāyata
ayaṃ vai loka āyurasau gauridamevāntarikṣaṃ jyotiḥ
tametaṃ purastādakurvātāṃ yathā putramevam
ito vā ayamūrdhvo loko'rvāṅasāvamutaḥ
tadidamenayoḥ purastājjyotiḥ paryūḍham
tena paśyāmaḥ
tau yogamupaprayantāvantamabhi jyotirvyudauhatām
sa yathā pitarau putraṃ pūrvaṃ yantaṃ paścādanviyātāṃ tādṛktat
tadetanmithunī stomā bhavanti yadyujyante
madhye vai jāyāpatyoḥ putraśśete
tau yathā mithunībhaviṣyantāvitthādvetthādvā putraṃ parihareyātāṃ tādṛgevaitat
ta eta ūnātiriktā mithunāḥ prajanaya stomāḥ

Now these stomas are Jyotis, Gauḥ, and Āyus.
Gauḥ mounted Āyus;
from that, Jyotis was born.
This world is Āyus; that [world] is Gauḥ; this intermediate space is Jyotis.
They two placed it in front, just like a son.
From here, this world is upward; that one from there is downward.
Therefore, this light (Jyotis) is placed in front of these two.
By means of it, we see.
They two, approaching union, pushed Jyotis outward towards the end.
That is just as when parents follow after a son going before them.
Therefore, these stomas become a pair when they are yoked.
Between husband and wife, indeed, sleeps the son.
Just as they, being about to unite sexually, would set the son aside to this side or that, just so is this.
These are unequal and exceeding, pairs, stomas for procreation.