Shiva Purana
इत्थमावरणाभ्यर्चां कृत्वा विक्षेपशान्तये ॥ पुनरभ्यर्च्य देवेशम्प्रणवं च शिवं वदेत्॥ २९॥
After performing the Āvaraṇa worship thus, the devotee shall worship the lord of the gods again for allaying his mental disturbance. He shall know Praṇava as Śiva.
english translation
itthamAvaraNAbhyarcAM kRtvA vikSepazAntaye ॥ punarabhyarcya devezampraNavaM ca zivaM vadet॥ 29॥
hk transliteration by Sanscript