Valmiki Ramayana Bala Kanda Sarga 1 Shloka 49
Original Shlokaततो ज्ञातिवधं श्रुत्वा रावणः क्रोधमूर्छितः ।।1.1.49।। सहायं वरयामास मारीचं नाम राक्षसम् ।
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तत: thereafter, रावणः Ravana, ज्ञातिवधम् slaughter of fellow rakshasas, श्रुत्वा having heard, क्रोधमूर्छितः became violent with anger, मारीचं नाम named Maricha, राक्षसम् rakshasa, सहायम् help, वरयामास sought for.
Having heard the slaughter of fellow rakshasa, Ravana became violent with anger and sought the help of a rakshasa named Maricha.