Since you were indifferent to the Kurus and the Pandavas whilst they killed each other, therefore, O Govinda, you will be the destroyer of your own kinsmen.
यस्मात् परस्परं अन्तो ज्ञातयः कुरुपाण्डवाः। उपेक्षितास्ते गोविन्द तस्माज्ज्ञातीन् वधिष्यसि॥