Matsya Purana 227.67

227.67

sthāpitāñcāpi maryādāṃ ye bhindyuḥ pāpakarmiṇaḥ.
sarve pṛthak daṇḍanīyā rājñā prathamasāhasam .. 227.66 ..

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