Shiva Purana
त्यक्तं तद्दन्तपवनं दृश्यते गुरुणा यदि ॥ प्रागुदक्पश्चिमे वाग्रे शिवमन्यच्छिवेतरम् ॥ ३९ ॥
If the teacher sees that the tooth wind has been abandoned, In the east, north and west, in the forehead, there is another Shiva and another Shiva.
english translation
tyaktaM taddantapavanaM dRzyate guruNA yadi ॥ prAgudakpazcime vAgre zivamanyacchivetaram ॥ 39 ॥
hk transliteration by Sanscript