Valmiki Ramayana Ayodhya Kanda Sarga 111 Shloka 29
Original Shlokaउपधिर्न मया कार्यो वनवासे जुगुप्सितः। युक्तमुक्तं च कैकेय्या पित्रा मे सुकृतं कृतम्।।2.111.29।।
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मया by me, वनवासे in the matter of living in the forest, जुगुप्सितः reprehensible, उपधिः placing a substitute, न कार्यः shall not be done, कैकेय्या by Kaikeyi, युक्तम् rightly, उक्तम् spoken, मे पित्रा by my father, सुकृतम् good deed, कृतम् has been done.
As far as living in the forest is concerned it is reprehensible to keep a subsitute for me and it shall not be done. Kaikeyi has acted rightfully and my father has taken the proper decision.