Valmiki Ramayana Ayodhya Kanda Sarga 52 Shloka 48
Original Shlokaतन्न शक्ष्याम्यहं गन्तुमयोध्यां त्वदृतेऽनघ। वनवासानुयानाय मामनुज्ञातुमर्हसि।।2.52.48।।
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तत् that is why, अनघ O sinless one, त्वदृते without you, अहम् I, अयोध्याम् to Ayodhya, गन्तुम् to go, न शक्ष्यामि cannot, माम् me, वनवासानुयानाय to accompany you in exile, अनुज्ञातुम् to give consent, अर्हसि behoves you.
That is why, O sinless one I cannot go back to Ayodhya without you. Allow me to accompany you into your exile.