Ramayana
अन्वियाय सुमित्रा च कैकेयी च यशस्विनी । धर्मं कृत्वा बहुविधं त्रिदिवे पर्यवस्थिता ॥ 7-99-16 ॥
Sumitra followed her, and the illustrious Kaikeyi as well; having performed manifold acts of righteousness, they were established in heaven.
english translation