Valmiki Ramayana Ayodhya Kanda Sarga 52 Shloka 20
Original Shlokaइति ब्रुवन्नात्मसमं सुमन्त्रः सारथिस्तदा। दृष्ट्वा दूरगतं रामं दुःखार्तो रुरुदे चिरम्।।2.52.20।।
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तदा then, सारथिः charioteer, सुमन्त्रः Sumantra, इति thus, ब्रुवन् saying, दूरगतम् gone afar, आत्मसमम् like his own self, रामम् Rama, दृष्ट्वा seeing, दुःखार्तः agonised, चिरम् long time, रुरुदे cried.
Rama was like his (Sumantra's) own self. When Sumantra, the charioteer, saw that Rama was preparing to go afar for a long time, he started weeping aloud in deep distress.