Shiva's 8 Idols

शतरुद्रसंहितायां शिवाष्टमूर्तिवर्णनं नाम द्वितीयोऽध्यायः
Shatrudra Samhita, Shiva's 8 idol description Chapter 2



नन्दीश्वर उवाच |
Nandishwara said (to Sanatkumara)



शर्वो भवस्तथा रुद्र उग्रो भीमः पशोः पतिः |
ईशानश्च महादेवो मूर्तयश्चाष्टविश्रुताः || 3 ||
Sharva, Bhava, Rudra, Ugra, Bhima, Pashupati, Ishana and Mahadeva are the eight well known idols.

This shloka repeats in Vayaviya Samhita, Later/north part, Chapter 3 as shloka 18.