Valmiki Ramayana Ayodhya Kanda Sarga 63 Shloka 45

अशक्ति: without energy, अपरिक्रमः who cannot walk, भिद्यमानम् being severed, नगम् tree, त्रातुम् to protect, अशक्तः is incapable, अन्यः other, नगः tree, इव like, जानन्नपि knowing also, किम् what, कुर्यात् can it do?

'What can my weak father who has no strength to walk do, even if he knows about it? Like a tree which cannot protect another which is being severed, he is helpless.