Valmiki Ramayana Aranya Kanda Sarga 28 Shloka 13
Original Shlokaतं सिंहमिव विक्रान्तं सिंहविक्रान्तगामिनम्। दृष्ट्वा नोद्विजते रामः सिंहः क्षुद्रमृगं यथा।।3.28.13।।
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सिंहमिव like a lion, विक्रान्तम् aggressive, सिंह विक्रान्तगामिनम् advancing to attack, तम् him, दृष्ट्वा seeing, रामः Rama, सिंहः lion, क्षुद्रमृगं यथा just like a fawn, नोद्विजते not perturbed.
When Rama saw Khara aggressively advancing like a lion to attack him, he was not perturbed, for he knew he was a fawn before a lion (which Rama was).