Valmiki Ramayana Ayodhya Kanda Sarga 47 Shloka 5

तथा in that way, अवितथक्रियः one to whom services rendered never go fruitless, महाबाहुः mightyarmed, सः राघवः that Rama, भक्तम् devoted, जनम् people, परित्यज्य abandoning, कथं नाम how, प्रवासम् exile, गतः has gone.

How is it that the mightyarmed Rama who never renders services done to him fruitless has deserted his devoted people and gone into exile?