Canto 3 -
Araṇya-kāṇḍa
Chapter 21: Śūrpaṇakhā Impels Khara to Attack Rāma
Text 3.21.20

रामतेजोऽभिभूतो हि त्वं क्षिप्रं विनशिष्यसि॥

rāma-tejo-’bhibhūto hi tvaṁ kṣipraṁ vinaśiṣyasi

rāma-tejaḥ-abhibhūtaḥ hi = overcome by Rāma’s prowess; tvam = you; kṣipram = quickly; vinaśiṣyasi = will perish.

Overcome by Rāma’s prowess, you will quickly perish.