Valmiki Ramayana Bala Kanda Sarga 49 Shloka 8
Original Shlokaअग्नेस्तु वचनं श्रुत्वा पितृदेवास्समागता:। उत्पाट्य मेषवृषणौ सहस्राक्षे न्यवेशयन्।।1.49.8।।
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समागता: assembled, पितृदेवा: pitrudevatas, अग्ने: Agni's, वचनम् words, श्रुत्वा having heard, मेषवृषणौ testicles of ram, उत्पाट्य extracting, सहस्राक्षे for Indra, न्यवेशयन् grafted.
Hearing the words of the Firegod the pitrudevatas assembled, uprooted the testicles of the ram and grafted them on to Indra.