Charak Samhita
तस्मात्तं विधिवद्युक्तैरन्नपानेन्धनैर्हितैः। पालयेत् प्रयतस्तस्य स्थितौ ह्ययुर्बलस्थितिः॥४०॥
An individual should take utmost care to maintain the agni by providing fuel in the form of food and drinks which should be taken as per the rules mentioned, because life and strength of an individual depends on agni
english translation
tasmAttaM vidhivadyuktairannapAnendhanairhitaiH। pAlayet prayatastasya sthitau hyayurbalasthitiH॥40॥
hk transliteration by Sanscript