Charak Samhita
संयोगाः सप्तपञ्चाशत् कल्पना तु त्रिषष्टिधा। रसानां तत्र योग्यत्वात् कल्पिता रसचिन्तकैः ॥२४॥
Thus, the scholars of rasa, have mentioned fifty-seven combinations and sixty-three forms of rasas (after adding six pure forms of rasas in fifty-seven combinations) on the basis of their applicability.
english translation
saMyogAH saptapaJcAzat kalpanA tu triSaSTidhA। rasAnAM tatra yogyatvAt kalpitA rasacintakaiH ॥24॥
hk transliteration by Sanscript