Skandapurana 5.273.56_8

5.273.56_8

yaḥ śiṣyo guruvākyaṃ tu na karoti yathoditam ..
tasya vrataṃ ca tadvyarthaṃ narakaṃ ca tataḥ param .. 34 ..

The disciple who does not carry out the guru's word as spoken, / his vow is useless, and after that he goes to hell.”