Shiva Purana
लिंगलक्षणयुक्तत्वान्मम लिंगं भवेदिदम् । तदिदं नित्यमभ्यर्च्यं युवाभ्यामत्र पुत्रकौ ४२ ।
Since it has all the characteristic features of my phallic emblem, it shall be my symbol. O sons, you shall worship it every day.
english translation
liMgalakSaNayuktatvAnmama liMgaM bhavedidam । tadidaM nityamabhyarcyaM yuvAbhyAmatra putrakau 42 ।
hk transliteration by Sanscript