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Bg 8.18

avyaktād vyaktayaḥ sarvāḥ
prabhavanty ahar-āgame
rātry-āgame pralīyante
tatraivāvyakta-saṁjñake
Synonyms: 
avyaktāt — from the unmanifest; vyaktayaḥ — living entities; sarvāḥ — all; prabhavanti — become manifest; ahaḥ-āgame — at the beginning of the day; rātri-āgame — at the fall of night; pralīyante — are annihilated; tatra — into that; eva — certainly; avyakta — the unmanifest; saṁjñake — which is called.
Translation: 
At the beginning of Brahmā’s day, all living entities become manifest from the unmanifest state, and thereafter, when the night falls, they are merged into the unmanifest again.