Kautilya's Arthashastra 4.8.28

4.8.28

tasyābhiśastāṅko lalāṭe syād vyavahārapatanāya, steyo śvā, manuṣyavadhe kabandhaḥ, gurutalpe bhagam, surāpāne madyadhvajaḥ //

Whatever may be the nature of the crime, no Bráhman offender shall be tortured. The face of a Bráhman convict shall be branded so as to leave a mark indicating his crime:--the sign of a dog in theft, that of a headless body in murder; that of the female part (bhaga) in rape with the wife of a teacher, and that of the flag of vintners for drinking liquor.