Shivapurana 3.32.17

Śivapurāṇa (complete text) 3.32.17

dhyātvā śivaṃ ca taṃ sāmbaṃ japanpañcākṣaraṃ manum |
samabhyarcya ciraṃ kālaṃ cacāra paramaṃ tapaḥ ||