Shiva Purana
अखंडं स्थावरं लिंगं द्विखंडं चरमेव च । येकुर्वन्तिनरामूढानपूजाफलभागिनः ३४ ।
Those who make a stationary phallic image as a single whole and a mobile one pieced are fools. They never reap the benefit of worship.
english translation
akhaMDaM sthAvaraM liMgaM dvikhaMDaM carameva ca । yekurvantinarAmUDhAnapUjAphalabhAginaH 34 ।
hk transliteration by Sanscript