Mahabharata 1.3.82

1.3.82

tasya mahatā kālena guruḥ paritoṣaṃ jagāma |
tatparitoṣācca śreyaḥ sarvajñatāṃ cāvāpa |
eṣā tasyāpi parīkṣā vedasya || 82 ||

"Then Veda the other disciple of Ayoda-Dhaumya was called. His preceptor once addressed him, saying, 'Veda, my child, tarry some time in my house and serve thy preceptor. It shall be to thy profit.' And Veda having signified his assent tarried long in the family of his preceptor mindful of serving him. Like an ox under the burthens of his master, he bore heat and cold, hunger and thirst, at all times without a murmur. And it was not long before his preceptor was satisfied. And as a consequence of that satisfaction, Veda obtained good fortune and universal knowledge. And this was the trial of Veda.