Shiva Purana
ते शप्ता मुनिभिः षड्भिश्शिवनिन्दा पराः पुरा॥ न श्रोतव्या हि तद्वार्त्ता तेऽन्यथावादिनो यतः॥ १९ ॥
They indulged in insulting Śiva and hence were cursed by the seven sages. Their views should not be heard because they explain false notions.
english translation
te zaptA munibhiH SaDbhizzivanindA parAH purA॥ na zrotavyA hi tadvArttA te'nyathAvAdino yataH॥ 19 ॥
hk transliteration by Sanscript