Shiva Purana
ततः केनचिदंशेन मूर्तिमाविश्य कामपि ॥ अर्धनारीश्वरो भूत्वा ययौ देवस्स्वयं हरः ॥ ९ ॥
Becoming half-female after introducing certain parts into a certain image, the lord himself came there.
english translation
tataH kenacidaMzena mUrtimAvizya kAmapi ॥ ardhanArIzvaro bhUtvA yayau devassvayaM haraH ॥ 9 ॥
hk transliteration by Sanscript