Shiva Purana
शिवस्य तु शिवायाश्च हृन्मूर्तिशिवभाविते ॥ तयोराज्ञां पुरस्कृत्य ते मे कामं प्रयच्छताम् ॥ ४२ ॥
May the two heart-forms of Śiva and Śivā purified by Śiva grant my desire at the behest of the two—Śiva and Śivā.
english translation
zivasya tu zivAyAzca hRnmUrtizivabhAvite ॥ tayorAjJAM puraskRtya te me kAmaM prayacchatAm ॥ 42 ॥
hk transliteration by Sanscript