Bhagavad Gita Chapter 08, Text 18

Bg 8.18

avyaktad vyaktayah sarvah
prabhavanty ahar-agame
ratry-agame praliyante

Word for word: 
avyaktat — from the unmanifest; vyaktayah — living entities; sarvah — all; prabhavanti — become manifest; ahah-agame — at the beginning of the day; ratri-agame — at the fall of night; praliyante — are annihilated; tatra — into that; eva — certainly; avyakta — the unmanifest; samjnake — which is called.

Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
At the beginning of Brahma’s day, all living entities become manifest from the unmanifest state, and thereafter, when the night falls, they are merged into the unmanifest again.