Valmiki Ramayana Sundara Kanda Sarga 53 Shloka 16

भूयः again, बद्धस्य bound, मे for me, पुच्छस्य tail, उद्दीपनेन च by burning the same, रक्षांसि demons, कामम् surely, पीडाम् torment, कुर्वन्तु they may as they wish, मे me, मनसः mind, श्रमः exhausted, नास्ति not experienced.

'Let the demons torture me freely by setting fire to my tail. Let them bind me. I am not exhausted.