Ramayana
नचास्य भविता कश्चित्सदृशः शास्त्रदर्शने । वरुणश्च वरं प्रादान्नास्य मृत्युर्भविष्यति । वर्षायुतशतेनापि मत्पाशादुदकादपि ॥ 7-36-15 ॥
And there shall be none equal to him in the understanding of the scriptures. Varuna too granted a boon: He shall have no death; even by a hundred myriads of years, nor by my noose, nor by water shall he die.
english translation