In plain words
The second girl answers: His other mother Sumitrā went to him and said, To the forest itself you must go; the mother who bore him followed after him weeping, My Lord!; and at the word of the mother who was death to him [Kaikēyī] he went to the cruel forest. Sing of him who had no anger, and leap! Sing of Sītā's bridegroom, and leap!