Kautilya's Arthashastra 4.13.1

4.13.1

brāhmaṇam apeyam abhakṣyaṃ vā grāsayata uttamo daṇḍaḥ, kṣatriyaṃ madhyamaḥ, vaiśyaṃ pūrvaḥ sāhasadaṇḍaḥ, śūdraṃ catuṣpañcāśatpaṇo daṇḍaḥ //

HE who causes a Bráhman to partake of whatever food or drink is prohibited shall be punished with the highest amercement. He who causes a Kshatriya to do the same shall be punished with the middlemost amercement; a Vaisya, with the first amercement; and a Súdra, with a fine of 54 panas.