Valmiki Ramayana Ayodhya Kanda Sarga 19 Shloka 32

कान्तत्वात् because of his loveliness, लोककान्तस्य of the beloved of the people, अस्य his, महतीम् great, लक्ष्मीम् splendour, शीतरश्मेः of coolrayed (of Moon), क्षपा इव like night, राज्यनाशः loss of kingdom, न अपकर्षति did not diminish.

Rama was the beloved of the people. Loss of kingdom did not diminish his splendour just like night cannot diminish the splendour of the coolrayed Moon.