One verse

Srimad Bhagavatam 3.5.32

3.5.32

तामसो भूतसूक्ष्मादिर्यत: खं लिङ्गमात्मन: ॥ ३२ ॥

tamaso bhuta-suksmadir yatah kham lingam atmanah

tamasah
from the mode of passion
bhuta-suksma-adih
subtle sense objects
yatah
from which
kham
the sky
lingam
symbolic representation
atmanah
of the Supreme Soul.

The sky is a product of sound, and sound is the transformation of egoistic passion. In other words, the sky is the symbolic representation of the Supreme Soul.