Aitareya-Aranyaka: Second Aranyaka, First Adhyâya, Fifth Khanda
1. Then the Devas carried him (the breath) forth, and being carried forth, he was stretched out, and when people said, “He was stretched out,” then it was in the morning; when they said, “He is gone to rest,” then it was in the evening. Day, therefore, is the breathing up, night the breathing down.
2. Speech is Agni, sight that Aditya (sun), mind the moon, hearing the Dis (quarters): this is the prahitam samyoga, the union of the deities as sent forth. These deities (Agni, &c.) are thus in the body, but their (phenomenal) appearance yonder is among the deities—this was intended.
3. And Hiranyadat Vaida also, who knew this (and who by his knowledge had become Hiranyagarbha or the universal spirit), said: “Whatever they do not give to me, they do not possess themselves.” I know the prahitim samyoga, the union of the deities, as entered into the body. This is it.
4. To him who knows this all creatures, without being constrained, offer gifts.
5. That breath is (to be called) sattya (the true), for sat is breath, ti is food, yam is the sun. This is threefold, and threefold the eye also may be called, it being white, dark, and the pupil. He who knows why true is true (why sattya is sattya), even if he should speak falsely, yet what he says is true.