Valmiki Ramayana Bala Kanda Sarga 25 Shloka 19
Original Shlokaश्रूयते हि पुरा शक्रो विरोचनसुतां नृप। पृथिवीं हन्तुमिच्छन्तीं मन्थरामभ्यसूदयत्।।1.25.19।।
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नृप O Prince, पुरा in the days of the past, पृथिवीम् this earth, हन्तुम् to destroy, इच्छन्तीम् intending, विरोचनसुताम् daughter of Virochana, मन्थराम् Manthara, शक्र: Indra, अभ्यसूदयत् slew, श्रूयते हि it is heard.
O Prince It is heard that in the past Indra slew Manthara, Virochana's daughter who intended to destroy the earth.