Rasamanjari 4.10

4.10

vaiśyaḥ pītaprabhaḥ śūdraḥ kṛṣṇābho ninditaḥ smṛtaḥ /
brāhmaṇo dīyate roge kṣatriyo viṣabhakṣaṇe /
vaiśyo vyādhiṣu sarveṣu sarpadaṣṭāya śūdrakam //

the vaiśya is yellow-hued; the śūdra, dark-hued, is remembered as censured. / The brāhmaṇa is given in disease; the kṣatriya, in cases of poison-ingestion; / the vaiśya, in all diseases; for one bitten by a snake, the śūdra [is given].