Shiva Purana
बाणलिंगे च लौहे च सिद्धे लिंगे स्वयंभुवि । प्रतिमासु च सर्वासु न चंडोधिकृतो भवेत् १७ ।
In regard to Bāṇaliṅga, metallic liṅga, Siddha-liṅga and Svayambhū-liṅga and in all other idols, Caṇḍa, one of the attendants of Śiva, is not authorised.
english translation
bANaliMge ca lauhe ca siddhe liMge svayaMbhuvi । pratimAsu ca sarvAsu na caMDodhikRto bhavet 17 ।
hk transliteration by Sanscript