Shiva Purana
शिवलिंगे शिवाग्नौ च ह्यन्यासु प्रतिमासु च ॥ चिंत्यस्सौम्यतनुश्शंभुः कार्ये शांतिकपौष्टिके ॥ ४२ ॥
When quiescent or nourishing rites are being performed, Śiva shall be thought of as gentle in the phallic image in the Śiva-fire and in other idols as well.
english translation
zivaliMge zivAgnau ca hyanyAsu pratimAsu ca ॥ ciMtyassaumyatanuzzaMbhuH kArye zAMtikapauSTike ॥ 42 ॥
hk transliteration by Sanscript