Rig Veda 10.129.1
nāsad āsīn no sad āsīt tadānīṃ | nāsīd rajo no vyomā paro yat | kim āvarīvaḥ kuha kasya śarmann | ambhaḥ kim āsīd gambhīraṃ gabhīram
Then even non-existence was not, nor existence. There was no air, nor sky beyond it. What covered it? Where was it? In whose keeping? Was there then cosmic water, in depths unfathomed?
nāsad = not non-existence; āsīt = was; sad = existence; rajo = realm of air; vyomā = sky
Modern Physics Parallel
The Planck epoch (t < 10⁻⁴³ seconds): spacetime itself did not exist. Neither matter (sat) nor void (asat) — because the very concepts require spacetime as substrate. The quantum gravity regime where all known physics collapses.
This is not metaphor. At t=0, the concepts of "something" and "nothing" both require a temporal framework that did not yet exist. The Rig Veda precisely describes this condition — the absence of both categories — 12,000 years before Planck time was calculated.