Matsya Purana 227.62

227.62

yo yena patitenaiṣāṃ saṃsargaṃ yāti mānavaḥ.
sa tasyaiva vrataṃ kuryāt tatsaṃsargaviśuddhaye .. 227.61 ..

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