Ramayana
स राजा पृथिवीं सर्वां वशे कृत्वा सुधार्मिकः । राज्यं चैव नरव्याघ्र पुत्रवत्पर्यपालयत् ॥ 7-87-4 ॥
That most righteous king, having brought the whole earth under his sway, ruled his kingdom too, O tiger among men, as though it were his own son.
english translation