Valmiki Ramayana Yuddha Kanda Sarga 95 Shloka 20

धनदानुजः younger brother of Kubera, विभीषणवचः Vibheeshana's words, कुर्यात् स्मयदि had followed, इयम् this, लङ्का Lanka, श्मशानभूता crematorium, दुःखार्ता stricken with grief, न भविष्यति would not have become

"Had Ravana, the younger brother of Kubera followed the advice of Vibheeshana, this Lanka would not have been stricken with grief and turned into a crematorium."