Valmiki Ramayana Ayodhya Kanda Sarga 13 Shloka 13

नृशंसे O cruel one पापसङ्कल्पे O woman of evil intentions कैकेयि Kaikeyi, मम my, प्रियम् dear, सत्यपराक्रमम् truth as prowess, रामम् to Rama, विप्रियेण harmful, किम् why, योजयसे arranging, लोके in this world, मे to me, अतुला unequalled, अकीर्तिः infamy, परिभवश्च disgrace, ध्रुवं this is inevitable.

O cruel, malevolent Kaikeyi, why do you propose such a harmful act against Rama who has truth as his prowess and who is so dear to me? Certainly, you will get unparalleled infamy and disgrace in this world.