Shiva Purana

siva.sh/siva-purana/saturda-samhita/10/5

शिवावतारा अमिता सद्भक्तहितकारकाः ।। सङ्ख्या न शक्यते कर्तुं तेषां च मुनिसत्तमाः ।। ५।।

sanskrit

O excellent sages, Śiva’s incarnations are countless and conducive to the benefit of good devotees. Their number cannot be counted or specified.

english translation

zivAvatArA amitA sadbhaktahitakArakAH || saGkhyA na zakyate kartuM teSAM ca munisattamAH || 5||

hk transliteration by Sanscript