SB 12.6.63
ity ukto gurur apy aha
kupito yahy alam tvaya
vipravamantra sisyena
mad-adhitam tyajasv iti
Translation:
Addressed thus, the spiritual master Vaisampayana became angry and said: Go away from here! Enough of you, O disciple who insults brahmanas! Furthermore, you must immediately give back everything I have taught you.
Purport:
Sri Vaisampayana was angry because one of his disciples, Yajñavalkya, was insulting the other disciples, who were, after all, qualified brahmanas. Just as a father is disturbed when one son mistreats the father’s other children, the spiritual master is very displeased if a proud disciple insults or mistreats the guru’s other disciples.