Shiva Purana
ततस्त्रिपुण्ड्रं रचयेत्त्रियायुषसमाह्वयम् ॥ शिवभावं समागम्य शिवयोगमथाचरेत् ॥ २५ ॥
Then repeating the mantra ‘Triyāyuṣam’ he shall wear Tripuṇḍra marks. He shall realise his own Śiva-hood and perform ‘Śivayoga’.
english translation
tatastripuNDraM racayettriyAyuSasamAhvayam ॥ zivabhAvaM samAgamya zivayogamathAcaret ॥ 25 ॥
hk transliteration by Sanscript