Valmiki Ramayana Ayodhya Kanda Sarga 72 Shloka 33
Original Shlokaपिता हि भवति ज्येष्ठो धर्ममार्यस्य जानतः। तस्य पादौ ग्रहीष्यामि स हीदानीं गतिर्मम।।2.72.33।।
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धर्मम् the ways of righteousness, जानतः one who knows, आर्यस्य of the noble person, ज्येष्ठः eldest brother, पिता भवति हि becomes father, तस्य his, पादौ feet, ग्रहीष्यामि shall hold, स: he, इदानीम् now, मम my, गतिः हि is a refuge indeed.
To one who knows the ways of righteousness the elder brother is (like) the father. Indeed, he (Rama) is my refuge and I shall hold his feet now.