Shiva Purana

siva.sh/siva-purana/kotirudra-samhita/28/7

ततश्शिरांसि छित्त्वा च पूजनं शंकरस्य वै ।। प्रारब्धं दैत्यपतिना रावणेन महात्मना ।। ७।।

sanskrit

Then the ambitious Rāvaṇa, lord of Daityas, began to worship Śiva by cutting off his heads.

english translation

tatazzirAMsi chittvA ca pUjanaM zaMkarasya vai || prArabdhaM daityapatinA rAvaNena mahAtmanA || 7||

hk transliteration by Sanscript