Shiva Purana
आवाहयेत्ततो देव्या शिवं परमकारणम् ॥ शुद्धस्फटिकसंकाशं देवं निश्चलमक्षरम् ॥ ३४ ॥
Then one should invoke Lord Śiva, the supreme cause, by the goddess Durgā. The god is motionless and infallible, resembling pure crystal.
english translation
AvAhayettato devyA zivaM paramakAraNam ॥ zuddhasphaTikasaMkAzaM devaM nizcalamakSaram ॥ 34 ॥
hk transliteration by Sanscript