Charak Samhita
प्राणाः प्राणभृतामन्नं तदयुक्त्या निहन्त्यसून् । विषं प्राणहरं तच्च युक्तियुक्तं रसायनम् ॥६०॥
Food is like the vitality of life for the human beings; but the same may be fatal if ingested improperly. The poison is fatal, but it can be rasayana if used sensibly.
english translation
prANAH prANabhRtAmannaM tadayuktyA nihantyasUn । viSaM prANaharaM tacca yuktiyuktaM rasAyanam ॥60॥
hk transliteration by Sanscript