Shiva Purana
त्रियायुषैस्त्र्यम्बकैश्च प्रणवेन शिवेन च॥ शिरस्यथ ललाटे च वक्षसि स्कन्ध एव च॥ २५ ॥
Triyayushas and Trimbakas and the oṁkāra and Siva. On the head, forehead, chest and shoulders.
english translation
triyAyuSaistryambakaizca praNavena zivena ca॥ zirasyatha lalATe ca vakSasi skandha eva ca॥ 25 ॥
hk transliteration by Sanscript