Skandapurana 6.3.209.85

6.3.209.85

brahmaghne ca surāpe ca steye gurvaṅganāgame .
niṣkṛtirvihitā śāstre kṛtaghne nāsti niṣkṛtiḥ .. 209.85 ..

For a slayer of a brahmin, for a drinker of liquor, for theft, and for violation of the guru's bed,
an expiation is prescribed in scripture; for the ungrateful, there is no expiation.