Charak Samhita
चिकित्सितस्तु संश्रुत्य योवाऽसंश्रुत्य मानवः। नोपाकरोति वैद्याय नास्ति तस्येह निष्कृतिः ॥५५॥
The treated patient, whether having promised or not, if does not offer any thing to the physician he is not freed.
english translation
cikitsitastu saMzrutya yovA'saMzrutya mAnavaH। nopAkaroti vaidyAya nAsti tasyeha niSkRtiH ॥55॥
hk transliteration by Sanscript