Śrīmad-Bhāgavatam 3.24.13
SB 3.24.13
Open the full passageSanskrit
etāvaty eva śuśrūṣā kāryā pitari putrakaiḥ bāḍham ity anumanyeta gauraveṇa guror vacaḥ
Translation
Sons ought to render service to their father exactly to this extent. One should obey the command of his father or spiritual master with due deference, saying, "Yes, sir."