Valmiki Ramayana Yuddha Kanda Sarga 91 Shloka 24
Original Shlokaसंदर्शयामासतदारावणिंरघुनन्दनः ।।6.91.24।। असम्ब्रान्तोमहातेजेस्तदद्भुतमिवाभवत् ।
1 source checked for this shloka
महतेजाः highly energetic, रघुनन्दनः delight of Raghus, असम्भ्रान्तः without reacting, तदा then, रावणिम् Indrajith, संदर्शयामास demonstrated, तत् his, अद्भुतमिव wonder, अभूत् indeed
Highly energetic Lakshmana, a delight of Raghus, unperturbed, demonstrated to Indrajith, which was a wonder indeed.