Charak Samhita
जलकर्षणबीजर्तुसंयोगात् सस्यसम्भवः। युक्तिः षड्धातुसंयोगाद्गर्भाणां सम्भवस्तथा ॥२३॥
॥ Yukti (reasoning)॥ Water, ploughed piece of land, seeds and the season in which particular seeds are sown, when combined together, result in a crop. Similarly, combination of six factors (pancha mahabhuta and atman) is responsible for formation of a fetus in the uterus.
english translation
jalakarSaNabIjartusaMyogAt sasyasambhavaH। yuktiH SaDdhAtusaMyogAdgarbhANAM sambhavastathA ॥23॥
hk transliteration by Sanscript