Valmiki Ramayana Ayodhya Kanda Sarga 27 Shloka 11
Original Shlokaसुखं वने निवत्स्यामि यथैव भवने पितुः। अचिन्तयन्ती त्रीन्लोकांश्च्चिन्तयन्ती पतिव्रतम्।।2.27.11।।
1 source checked for this shloka
त्रीन् लोकान् the three worlds, अचिन्तयन्ती without thinking, पतिव्रतम् duties to the husband, चिन्तयन्ती while thinking, वने in the forest, पितुः father's, भवने in the palace, यथैव the same way, सुखम् happily, निवत्स्यामि I shall dwell.
Free from any anxiety about the three worlds, my only concern will be my duties towards my husband. I shall dwell as happily in the forest as I did in my father's abode.