Matsya Purana 227.63

227.63

patitasyodakaṃ kāryaṃ sapiṇḍairbāndhavaiḥ saha.
nindite'hani sāyāhne jñātibhirgurusannidhau .. 227.62 ..

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