One verse

Srimad Bhagavatam 1.10.21

1.10.21

स वै किलायं पुरुष: पुरातनो य एक आसीदविशेष आत्मनि । अग्रे गुणेभ्यो जगदात्मनीश्वरे निमीलितात्मन्निशि सुप्तशक्तिषु ॥ २१ ॥

sa vai kilayam purusah puratano ya eka asid avisesa atmani agre gunebhyo jagad-atmanisvare nimilitatman nisi supta-saktisu

sah
He (Krsna)
vai
as I remember
kila
definitely
ayam
this
purusah
Personality of Godhead
puratanah
the original
yah
who
ekah
only one
asit
existed
avisesah
materially unmanifested
atmani
own self
agre
before creation
gunebhyah
of the modes of nature
jagat-atmani
unto the Supersoul
isvare
unto the Supreme Lord
nimilita
merged into
atman
the living entity
nisi supta
inactive at night
saktisu
of the energies

They said: Here He is, the original Personality of Godhead as we definitely remember Him. He alone existed before the manifested creation of the modes of nature, and in Him only, because He is the Supreme Lord, all living beings merge, as if sleeping at night, their energy suspended.