Shiva Purana

siva.sh/siva-purana/uma-samhita/38/39

आग्नेयं तं महाभागो ह्यमरैरपि दुस्सहम् ।। जग्राह विधिना प्रीत्या सगरोसौ नृपोत्तमः ।। ३९ ।।

sanskrit

The blessed Sagara, earnestly learnt the lore of the fiery missile, in accordance with the rules of procedure, the missile that is unbearable even to the gods.

english translation

AgneyaM taM mahAbhAgo hyamarairapi dussaham || jagrAha vidhinA prItyA sagarosau nRpottamaH || 39 ||

hk transliteration by Sanscript