Ramayana
तस्यासौ दण्डविषयो विन्ध्यशैवलयोर्नृप । शप्तो ब्रह्मर्षिणा तेन वैधर्म्ये सहिते कृते ॥ 7-81-18 ॥
That realm of Danda's, O king, lying between the Vindhya and the Shaivala mountains, was thus cursed by that Brahmarshi when the act contrary to righteousness had been committed.
english translation