एकजातिर्द्विजातींस्तु वाचा दारुणया क्षिपन् । जिह्वायाः प्राप्नुयाच्छेदं जघन्यप्रभवो हि सः ॥ २७० ॥
A once-born man (a Sudra), who insults a twice-born man with gross invective, shall have his tongue cut out; for he is of low origin.
english translation