Bhagavad Gita 8.18
At the dawn of that day, all objects in manifestation stream forth from the Unmanifest, and when evening falls, they are dissolved back into it again.
अव्यक्ताद्व्यक्तयः सर्वाः प्रभवन्त्यहरागमे।
रात्र्यागमे प्रलीयन्ते तत्रैवाव्यक्तसंज्ञके॥avyaktādvyaktayaḥ sarvāḥ prabhavantyaharāgame|
rātryāgame pralīyante tatraivāvyaktasaṃjñake||
English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).