One verse

Srimad Bhagavatam 2.5.22

2.5.22

कालाद् गुणव्यतिकर: परिणाम: स्वभावत: । कर्मणो जन्म महत: पुरुषाधिष्ठितादभूत् ॥ २२ ॥

kalad guna-vyatikarah parinamah svabhavatah karmano janma mahatah purusadhisthitad abhut

kalat
from eternal time
guna-vyatikarah
transformation of the modes by reaction
parinamah
transformation
svabhavatah
from the nature
karmanah
of activities
janma
creation
mahatah
of the mahat-tattva
purusa-adhisthitat
because of the purusa incarnation of the Lord
abhut
it took place.

After the incarnation of the first purusa (Karanarnavasayi Visnu), the mahat-tattva, or the principles of material creation, take place, and then time is manifested, and in course of time the three qualities appear. Nature means the three qualitative appearances. They transform into activities.