Ramayana
ततो रामानुजः क्रुद्धः कालस्यास्त्रं सुदारुणम् । संवर्तं नाम भरतो गन्धर्वेष्वभ्यचोदयत् ॥ 7-101-7 ॥
Then Bharata, Rama's younger brother, in his wrath let loose against the Gandharvas the most dreadful weapon of Time, called the Samvarta.
english translation