Charak Samhita
पक्तिस्थानात्तथा दोषैरूष्मा क्षिप्तो बहिर्नृणाम्। न पचत्यभ्यवहृतं कृच्छ्रात् पचति वा लघु ॥२७५॥
Similarly, in a patient of jwara, the ūṡmā (digestive fire) is blown out of the paktī sthāna (place of digestion) and in this condition the consumed food is not digested properly.
english translation
paktisthAnAttathA doSairUSmA kSipto bahirnRNAm। na pacatyabhyavahRtaM kRcchrAt pacati vA laghu ॥275॥
hk transliteration by Sanscript