Shiva Purana
पूर्वाभिमुखमात्मीयतत्त्वज्ञानाभिलाषिणम्॥ स्वसनस्थो गुरुर्ब्रूयादमलात्मा भवेति तम् ॥ ४१ ॥
The preceptor shall be seated with the disciple facing the cast and desirous of spiritual knowledge. The preceptor shall tell him—“Be pure in soul.”
english translation
pUrvAbhimukhamAtmIyatattvajJAnAbhilASiNam॥ svasanastho gururbrUyAdamalAtmA bhaveti tam ॥ 41 ॥
hk transliteration by Sanscript