Valmiki Ramayana Ayodhya Kanda Sarga 51 Shloka 19
Original Shlokaअतिक्रान्तमतिक्रान्तमनवाप्य मनोरथम्। राज्ये राममनिक्षिप्य पिता मे विनशिष्यति।।2.51.19।।
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मे पिता my father, अतिक्रान्तमतिक्रान्तम् past is past, मनोरथम् his desire, अनवाप्य without fulfilling, राज्ये in the kingdom, रामम् Rama, अनिक्षिप्य without installing, विनशिष्यति will die.
Past is past (irreversible). My father, brooding over his desire of installing Rama as king unfulfilled, will perish.