Bhagavatapurana 3.26.42

3.26.42

kaṣāyo madhuras tiktaḥ kaṭv amla iti naikadhā /
bhautikānāṃ vikāreṇa rasa eko vibhidyate //

41. When urged by the Deity, it underwent modification, out of Tejas embodying the subtle principle of colour was evolved Ambhas or water endowed with the subtle principle of Rasa or taste ; the tongue is the organ for apprehending Rasa or taste ; and the only one Rasa or taste becomes differentiated into many on account of the change due to the combination of the products of the Bhutas, as astringent, sweet, pungent, bitter, sour and saltish.