Valmiki Ramayana Ayodhya Kanda Sarga 33 Shloka 11

निर्गुणस्यापि even one bereft of virtues, पुत्रस्य of a son, विप्रवासनम् banishment, कथम् how, स्यात् can it be, यस्य whose, वृत्तेन केवलम् by good conduct alone, अयं लोकः this world, जितः conquered, किं पुनः why to say again?

Even a son who is bereft of virtues cannot be banished, what to say about Rama, who by good conduct alone has conquered the world.