Matsya Purana 227.66

227.66

jyeṣṭhabhāvānnivarteta jyaiṣṭhyāvāptaṃ ca yatpunaḥ.
jyeṣṭhāṃśaṃ prāpnuyāccāsya yo vā syād guṇato'dhikaḥ .. 227.65 ..

A Brâhmaṇa who indulges with a Châṇḍâla woman or a woman of a different caste or eats their food or accepts a gift from them unknowingly tolas of gold or silver according to the seriousness of the offence The one who breaks anyone's bone should be exiled from the country—87