Charak Samhita
अन्नपानैर्नयेच्छान्तिं दीप्तमग्निमिवाम्बुभिः। मुहुर्मुहुरजीर्णेऽपि भोज्यान्यस्योपहारयेत्॥२२२॥
The patient should be administered food at regular interval although previously eaten meal is undigested so that atyagni due to lack of fuel does not digest the tissues
english translation
annapAnairnayecchAntiM dIptamagnimivAmbubhiH। muhurmuhurajIrNe'pi bhojyAnyasyopahArayet॥222॥
hk transliteration by Sanscript