Ramayana
नाधर्मसहितं श्लाध्यं तल्लोकं प्रतिसंहितम् । कर्म दौरात्म्यकं कृत्वा श्लाघ्यसे भ्रातृनिर्जयात् ॥ 7-18-12 ॥
That deed which is bound up with unrighteousness is not praiseworthy, nor is it conducive to the higher world; having done a wicked act, you are praised merely for the conquest of your brother.
english translation