Valmiki Ramayana Yuddha Kanda Sarga 44 Shloka 9
Original Shlokaलक्ष्मणश्चापिरामश्चशरैराशीविषोपमैः ।।6.44.9।। दृश्यादृश्यानिरक्षांसिप्रवराणिनिजघ्नतुः ।
1 source checked for this shloka
रामश्च Rama as well, लक्ष्मणश्चापि as Lakshmana also, आशीविषोपमैः shining like venomous snakes, शरैः arrows, दृश्यादृश्यानि visible and invisible, प्रवराणि principal, रक्षांसि Rakshasas, निजघ्नतुः killed
Then Rama as well as Lakshmana with their venomous snakelike arrows killed both visible and invisible principal Rakshasas.