Valmiki Ramayana Ayodhya Kanda Sarga 104 Shloka 5
Original Shlokaआर्यं तातः परित्यज्य कृत्वा कर्म सुदुष्करम्। गत: स्वर्ग महाबाहुः पुत्रशोकाभिपीडितः।।2.104.5।।
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महाबाहुः mightyarmed, तातः father, आर्यं my esteemed brother, परित्यज्य having abandoned, सुदुष्करम् impossible to perform, कर्म task, कृत्वा having done, पुत्रशोकाभिपीडितः tortured by the grief due to separation from his son, स्वर्गम् heaven, गतः went.
O my revered sire our mighty father, having performed an impossible task of banishing you to the forest, and tortured by grief due to separation from his son, went to heaven.