Valmiki Ramayana Ayodhya Kanda Sarga 34 Shloka 35

पुत्र son, राघव descendant of the Raghus, त्वया by you, सर्वथा by all means, दुष्करम् difficult task, क्रियते is being done, यत् for that reason, मत् प्रियार्थम् for the sake of my pleasure, प्रियान् dear ones, त्यक्त्वा having forsaken, विजनम् deserted place, वनम् to the forest, यासि are going.

O my son, O descendant of the Raghus, you are called upon to accomplish, by all means, a very difficult task. For the sake of my pleasure you are forsaking your dear ones and going to the desolate forest.