Shiva Purana

siva.sh/siva-purana/saturda-samhita/1/43

वामदेवाह्वयो रूपश्चतुर्थः शङ्करस्य हि ।। अहंकृतेरधिष्ठानो बहुकार्यकरः सदा ।। ४३ ।।

sanskrit

The fourth form of Śiva is Vāmadeva who presides over the ego and is engaged in many incessant activities.

english translation

vAmadevAhvayo rUpazcaturthaH zaGkarasya hi || ahaMkRteradhiSThAno bahukAryakaraH sadA || 43 ||

hk transliteration by Sanscript