Valmiki Ramayana Ayodhya Kanda Sarga 64 Shloka 67
Original Shlokaअतस्तु किं दुःखतरं यदहं जीवितक्षये। न हि पश्यामि धर्मज्ञं रामं सत्यपराक्रमम्।।2.64.67।।
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अहम् I, जीवितक्षये at the last moment of my life, धर्मज्ञम् to the knower of righteousness, सत्यपराक्रमम् to one possessing the strength of truth, रामम् Rama, न पश्यामि हि इति यत् the fact that I am unable to see, अतः more than this, दुःखतरम् more sorrowful, किं नु what is there?
Can there be a greater sorrow than that at the last moment of my life I am unable to see my righteous and truthful son, Rama?