Valmiki Ramayana Ayodhya Kanda Sarga 24 Shloka 34
Original Shlokaप्रत्यागते महाभागे कृतार्थे चरितव्रते। पितुरानृण्यतां प्राप्ते त्वयि लप्स्ये परं सुखम्।।2.24.34।।
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महाभागे when the reverend one, त्वयि you, कृतार्थे with your purpose accomplished, चरितव्रते when your vow is fulfilled, पितुः father's, आनृण्यताम् acquittal of debt, प्राप्ते obtained, प्रत्यागते on coming back, परम् supreme, सुखम् happiness, लप्स्ये I will attain.
O reverend one, when you come back after having accomplished your purpose, performed your vows and acquitted yourself of the debt you owe your father, I shall attain supreme happiness.