Shiva Purana
लिंगादावपि तत्कृत्यमर्चायां च विशेषतः ॥ तत्तन्मूर्त्यात्मभावेन शिवो ऽस्माभिरुपास्यते ॥ १७ ॥
In the form of different idols, phallic etc. and particularly in Arcā (offerings of flowers etc.) Śiva is worshipped by us.
english translation
liMgAdAvapi tatkRtyamarcAyAM ca vizeSataH ॥ tattanmUrtyAtmabhAvena zivo 'smAbhirupAsyate ॥ 17 ॥
hk transliteration by Sanscript