Canto 3 -
Araṇya-kāṇḍa
Chapter 61: Rāma’s Lamentation
Text 3.61.6
सीतया रहितोऽहं वै नहि जीवामि लक्ष्मण॥
sītayā rahito ’haṁ vai na hi jīvāmi lakṣmaṇa
sītayā = Sītā; rahitaḥ = without; aham = I; vai na hi = never; jīvāmi = can live; lakṣmaṇa = Lakṣmaṇa.
Lakṣmaṇa, I can never live without Sītā!