aho bata mahatpāpaṃ kartuṃ vyavasitā vayam |yadrājyasukhalobhena hantuṃ svajanamudyatāḥ ||
Alas, what a great sin we have resolved to commit, in that out of greed for the pleasures of a kingdom we are ready to kill our own kin.
Explanation
Arjuna, overcome with grief on the battlefield, has just spoken of the suffering that follows the breakdown of family duty (dharma). Here he turns the blame on himself and his side, saying that greed (lobha) for the comforts of ruling is driving them toward a grave wrong (pāpa). His words show his moral distress before he lays down his weapons.