Valmiki Ramayana Aranya Kanda Sarga 45 Shloka 21
Original Shlokaअनार्याकरणारम्भ नृशंस कुलपांसन।।3.45.21।। अहं तव प्रियं मन्ये रामस्य व्यसनं महत्।
1 source checked for this shloka
अनार्यकरणारम्भ man of bad conduct, नृशंस cruel one, कुलपांसन disgrace to your family, रामस्य at Rama's, महत् great, व्यसनम् disaster, तव yours, प्रियम् pleasing, अहम् I, मन्ये I think.
O ignoble, cruel Lakshmana, you are a disgrace to your family. I think this great disaster of Rama is a pleasure to you.