Srimad-Bhagavatam: Canto 12 - Chapter 1 - Verse 38
Sanskrit:
नित्यो नैमित्तिकश्चैव तथा प्राकृतिको लय: ।आत्यन्तिकश्च कथित: कालस्य गतिरीदृशी ॥ ३८ ॥
ITRANS:
nityo naimittikaś caivatathā prākṛtiko layaḥātyantikaś ca kathitaḥkālasya gatir īdṛśī
Translation:
In this way the progress of time is described in terms of the four kinds of annihilation — continuous, occasional, elemental and final.