One verse

Srimad Bhagavatam 2.1.28

2.1.28

उर:स्थलं ज्योतिरनीकमस्य ग्रीवा महर्वदनं वै जनोऽस्य । तपो वराटीं विदुरादिपुंस: सत्यं तु शीर्षाणि सहस्रशीर्ष्ण: ॥ २८ ॥

urah-sthalam jyotir-anikam asya griva mahar vadanam vai jano ’sya tapo varatim vidur adi-pumsah satyam tu sirsani sahasra-sirsnah

urah
high
sthalam
place (the chest)
jyotih-anikam
the luminary planets
asya
of Him
griva
the neck
mahah
the planetary system above the luminaries
vadanam
mouth
vai
exactly
janah
the planetary system above Mahar
asya
of Him
tapah
the planetary system above the Janas
varatim
forehead
viduh
is known
adi
the original
pumsah
personality
satyam
the topmost planetary system
tu
but
sirsani
the head
sahasra
one thousand
sirsnah
one with heads

The chest of the Original Personality of the gigantic form is the luminary planeary system, His neck is the Mahar planes, His mouth is the Janas planes, and His forehead is the Tapas planeary system. The topmost planeary system, known as Satyaloka, is the head of He who has one thousand heads.