The Compendium of Caraka 1.26.9

1.26.9

ṣaḍeva rasā ityuvāca bhagavānātreyaḥ punarvasuḥ madhurāmlalavaṇakaṭutiktakaṣāyāḥ /

“Tastes are only six,” said the venerable Ātreya Punarvasu: “sweet, sour, saline, pungent, bitter, and astringent.”