Yuga-Vibhāga and Kāla-Pramāṇa
Measures of Time and the Four Yugas
तदा धर्म्मसहस्रान्ते ऽहिंसाधर्मः प्रवर्त्तते / जायन्ते च तदा शूरा आयुष्मन्तो महाबलाः
tadā dharmmasahasrānte 'hiṃsādharmaḥ pravarttate / jāyante ca tadā śūrā āyuṣmanto mahābalāḥ
Then, at the close of a thousand measures of dharma, the dharma of non‑violence comes forth; and in that time are born heroes—long‑lived and mighty.