The Compendium of Bheḷa 8.1.8

8.1.8

kanīyasā pramāṇena parīkṣeta ca buddhimān | tripalaṃ śreṣṭham ākhyātaṃ kanīyas tu palaṃ bhavet ||

the intelligent physician should test with a small measure. / Three palas is declared the highest, while the smallest would be one pala;