Valmiki Ramayana Yuddha Kanda Sarga 7 Shloka 21
Original Shlokaअनेनहिमहाराजमहेश्वरमनुत्तमम् । इष्ट्वायज्ञंवरोलब्धोलोकेपरमदुर्लभः ।।6.7.21।।
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अनेन: by him, महाराज: great king, महेश्वर: Lord Maheshwara (Siva), अनुत्तमम्: supreme इष्ट्वायज्ञं: performing sacrifice, लब्धो: obtained, लोके: in the world, परमदुर्लभः very difficult, वरो: boon.
"Oh Great King By performing supreme sacrifices, Indrajith obtained boons from Lord Maheswara, which are very difficult to get."