Srimad Bhagavatam Canto 10, Chapter 88, Text 03

SB 10.88.3

sri-suka uvaca
sivah sakti-yutah sasvat
 tri-lingo guna-samvrtah
vaikarikas taijasas ca
 tamasas cety aham tridha
 
Translation: 
 
Sri Sukadeva said: Lord Siva is always united with his personal energy, the material nature. Manifesting himself in three features in response to the entreaties of nature’s three modes, he thus embodies the threefold principle of material ego in goodness, passion and ignorance.
Srimad Bhagavatam Canto 10, Chapter 88, Text 02
Srimad Bhagavatam Canto 10, Chapter 88, Text 04