Sanskrit
यावत्सञ्जायते किञ्चित्सत्त्वं स्थावरजङ्गमम् । क्षेत्रक्षेत्रज्ञसंयोगात्तद्विद्धि भरतर्षभ ॥
yāvat sañjāyate kiñcit sattvaṃ sthāvarajaṅgamam kṣetrakṣetrajñasaṃyogāt tad viddhi bharatarṣabha
Translation
Whatsoever creature is born immobile or mobile, know thou, O best of the Bhâratas, that it is from the union between the Field and the Knower of the Field.
Annie Besant · The Bhagavad-Gita, translated by Annie Besant (4th ed., 1922) — Wikisource · Public Domain
Explanation
A cosmological claim that generalizes the whole chapter beyond the individual case: every being that is born, whether it moves or not, arises specifically from the union (samyoga) of the Field and the Knower of the Field. It grounds the theoretical apparatus of verses 1-26 in the most basic observable fact available — that anything is alive at all — treating birth itself as evidence for the kshetra/kshetrajna framework rather than something the framework merely explains after the fact.