Shiva Purana
ततस्तेन क्रमेणैव समुद्धृत्य च भस्मना ॥ सर्वांगोद्धूलनं कुर्यात्प्रणवेन शिवेन वा ॥ २४ ॥
Then in the same way he shall dust the body entirely repeating the Praṇava Oṃ and ‘Śiva’.
english translation
tatastena krameNaiva samuddhRtya ca bhasmanA ॥ sarvAMgoddhUlanaM kuryAtpraNavena zivena vA ॥ 24 ॥
hk transliteration by Sanscript