One should never quit his (homa) fire. One should also renounce the study of the Vedas. One should never attack a Brahmana by words or decds. All these offences are equal to Brahmanicide.
नाग्निं परित्यजेज्जातु न च वेदान् परित्यजेत्। न च ब्राह्मणमाक्रोशेत् समं तद् ब्रह्महत्यया॥