Bhagavatapurana 3.8.20

3.8.20

tamasy apāre vidurātma-sargaṃ vicinvato 'bhūt sumahāṃs tri-ṇemiḥ /
yo deha-bhājāṃ bhayam īrayāṇaḥ parikṣiṇoty āyur ajasya hetiḥ //

20. O Vidura, when he thus made the search in boundless darkness for his own cause, there lapsed a very long long time (that which has three divisions) which is the weapon Sudarsana of the Unborn Lord, and which fills the beings of the world with fear and shortens their life.