The holy scripture, " Sri Guru Geeta" reveals how Lord Shiva in His lessons on "Guru" to Goddess Parvathi strongly condemns fake "Gurus". Sri Guru Geeta is a part of Skaanda Puranam, authored by Sage Vyasa. This sacred scripture contains 351 slokas. Gems like excerpts about fake Gurus as Lord Shiva addresses the following slokas to Goddess Parvathi:-
198)Gnaanaheeno Guru Sthyaajyo Midhyaavaadee Vidambakaha
Svavishraanthim Na Jaanaathi Parashaanthim Karothi Kim.
Meaning:Do not recognise a foolish man as Guru. One who is quarrelsome and deceptive cannot achieve his own peace. When that is the case, he is not eligible to bring peace to his devotees.
199)Shilaayaaha Kim Paragnaanam Shilaasangha Prathaaraney
Svayam Tharthum Na Jaanaathi Param Nisthaaraye Thkadham.
Meaning:Such a person is like a big stone. He has the tendency to cheat few devotees. When this fellow himself does not know how to cross the shore of human life, how can he lead others?!
200)Na Vandaneeyaa Sthey Kashtam Darshanaa Dbhraanthikaarakaaha
Varjaye Ththaanguroon Doorey Dheerasya Thu Samaashrayeth.
Meaning:Fake Gurus who terrorise devotees just by their gaze are not fit to be worshipped. Such a Guru is to be chased away. Always worship a Guru who has knowledge of Self.
201)Paashandinaha Paaparathaa Naasthikaa Bhedabudhdhayaha
Sthreelampataa Duraachaaraaha Kruthaghnaa Bakavruththayaha.
Meaning:Pompous Gurus who are interested in bad vices, self-advertisement, atheism, propagation of controversial subjects, debaucherous, ungrateful and indulging in fake prayers are to be discarded.
202)Karmabhrashtaaha Kshamaanashtaa Nindyatharkaishcha Vaadinaha
Kaaminaha Krodhinashchaiva Himsraashchandaashshathaa Sthadhaa.
Meaning: Gurus who are unethical, immoral, impatient, who indulge in wasteful arguments, full of desires, aggressive and short-tempered and like to harass/torture, who are adamant and horrific by nature, yet advertise themselves as Gurus are also to be rejected and discarded.
203)Gnaanalupthaa Na Karthavyaa Mahaapaapaa Sthadhaa Priye
Ebhyo Bhinno Guru Ssevya Ekabhakthyaa Vichaarya Cha.
Meaning:Never consider a foolish man or a sinner as Guru. After careful inquiry, identify the correct person who has knowledge of Self and worship Him with faith.
204)Sishyaa Danyathra Deveshi Na Vadhey Dhyasya Kasyachith
Naraanaam Cha Phalapraapthau Bhakthi Reva Hi Kaaranam.
Meaning: Devi, please do no preach this to anybody other than the best devotee. A devotee attains the fruit of knowledge only through devotion.