Chandogya Upanishad 6.12

तेषां खल्वेषां भूतानां त्रीण्येव बीजानि भवन्त्याण्डजं जीवजमुद्भिज्जमिति ॥ १ ॥

6.3.1 — tesham khalvesham bhutanam trinyeva bijani bhavantyandajam jivajamudbhijjamiti || 1 ||

'Of all living things there are indeed three origins only, that which springs from an egg (oviparous), that which springs from a living being (viviparous), and that which springs from a germ.

'इन प्राणियों के तीन ही बीज होते हैं — अण्डज (अण्डे से उत्पन्न), जीवज (जरायुज, माता से उत्पन्न), और उद्भिज्ज (पृथ्वी को फोड़ कर उत्पन्न)।'