Matsya Purana 227.84

227.84

ekajātirdvijātintu yenāṅgenāparādhnuyāt.
tadeva cchedayettasya kṣipramevāvicārayan .. 227.83 ..

[A king should get that limb of a Śûdra severed from his body which he uses in causing pain to the twice-born—83]

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