Shiva Purana
मानस्तोकेन मंत्रेण मंत्रितं भस्म धारयेत् । ब्राह्मणः क्षत्रियश्चैव प्रोक्तेष्वंगेषु भक्तिमान् ३३ ।
With great devotion Brahmins and Kṣatriyas shall apply the holy ashes over such parts of the body as are prescribed by the rule repeating the mantra “Mānastoke” etc.
english translation
mAnastokena maMtreNa maMtritaM bhasma dhArayet । brAhmaNaH kSatriyazcaiva prokteSvaMgeSu bhaktimAn 33 ।
hk transliteration by Sanscript