Dhammapada Verses 19 and 20
The Story of Two Friends
Once there were two friends of noble family, two bhikkhus from Savatthi. One of them learned the Tipitaka and was very proficient in reciting and preaching the sacred texts. He taught five hundred bhikkhus and became the instructor of eighteen groups of bhikkhus. The other bhikkhu striving diligently and ardently in the course of Insight Meditation attained arahatship together with Analytical Insight.
On one occasion, when the second bhikkhu came to pay homage to the Buddha, at the Jetavana monastery, the two bhikkhus met. The master of the Tipitaka did not realize that the other had already become an arahat. He looked down on the other, thinking that this old bhikkhu knew very little of the sacred texts, not even one out of the five Nikayas or one out of the three Pitakas. So he thought of putting questions to the other, and thus embarass him. The Buddha knew about his unkind intention and he also knew that as a result of giving trouble to such a noble disciple of his, the learned bhikkhu would be reborn in a lower world.