Valmiki Ramayana Yuddha Kanda Sarga 91 Shloka 19

अथ and then, सौमित्रिः Saumithri, छिन्नधन्वानम् split the bow, एनम् thus, रावणिम् Indrajith, आशीविषविषोपमैः like venomous serpent, पञ्चभिः five, बाणैः arrows, उरसि chest, विव्याध pierced

Then Saumithri pierced with five arrows into the chest of Indrajith like a venomous serpent and split the bow.