CHĀNDOGYA UPANISHAD · 6.3.1

तेषां खल्व् एषां भूतानां त्रीण्य् एव बीजानि भवन्त्य् आण्डजं जीवजम् उद्भिज्जम् इति ॥

teṣāṃ khalv eṣāṃ bhūtānāṃ trīṇy eva bījāni bhavanty āṇḍajaṃ jīvajam udbhijjam iti ॥

'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.

F. Max Müller · The Upanishads, Sacred Books of the East 1 (1879)