Valmiki Ramayana Yuddha Kanda Sarga 91 Shloka 40
Original Shlokaततःसमरकोपेनसम्वृतोरावणात्मजः ।।6.91.40।। विभीषणंत्रिभिर्बाणैर्विव्याथवदनेशुभे ।
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ततः then, समरकोपेन filled with wrath of conflict, सम्वृतः occassioned by, रावणात्मजः Ravana's son, शुभे charming, वदने countenance, विभीषणम् Vibheeshana, त्रिभिः three, बाणैः arrows, विव्याथ struck
Then Ravana's son in his charming countenance, filled with wrath because of conflict, struck at Vibheeshana with three arrows.