Skandapurana 16.336.127

16.336.127

ekasminnidhanaṃ prāpte pāpiṣṭhe krūrakarmaṇi ..
bahūnāṃ bhavati kṣemastatra puṇyaprado vadhaḥ ..
satyevaṃ pṛthivīpāla dharmmaṃ mā tyaktumarhasi ..127..

When destruction befalls a single, most sinful person of cruel deeds, / safety arises for many; in that case killing confers merit. / Though this is so, O protector of the earth, you should not abandon righteousness.'