The brahmin Bilaṅgika Bhāradvāja insults the Buddha, but after the Buddha's response, he becomes a bhikkhu and soon attains arahantship.
Bilaṅgika sutta - Bilaṅgika
At one time, the Blessed One was dwelling in Rājagaha, in the Bamboo Grove, the Squirrels' feeding ground. Then, the brahmin Bilaṅgika Bhāradvāja heard: "It is said that the brahmin of the Bhāradvāja clan has gone forth from the household life into homelessness under the ascetic Gotama." Angry and irritated, he approached the Blessed One; having approached, he abused and insulted the Blessed One with impolite and harsh words.
Then the Blessed One, understanding with his mind the thoughts in the mind of the brahmin Bilaṅgika Bhāradvāja, addressed him in verse:
"Whoever harms a blameless person, a pure, blemish free individual; Harm returns [back] to that immature person, like fine dust thrown against the wind."
When this was said, the brahmin Bilaṅgika Bhāradvāja said to the Blessed One: "Excellent, venerable Gotama! Excellent, venerable Gotama! Just as if one might set upright what had been overturned, reveal what had been concealed, point out the way to one who was lost, or hold up a lamp in the dark so that those with eyes could see forms, in the same way, venerable Gotama, the Dhamma has been explained by you in many ways. I go for refuge to the Blessed One Gotama, to the Dhamma, and to the Saṅgha of bhikkhus. May I receive the going forth in the presence of the Blessed One Gotama, may I receive the full ordination."
The brahmin Bilaṅgika Bhāradvāja received the going forth in the presence of the Blessed One, he received the full ordination. Having recently received full ordination, the venerable Bilaṅgika Bhāradvāja, dwelling alone, secluded, diligent, with continuous effort, and resolutely, soon realized with direct knowing in this very life, for the purpose of which sons of good families rightly go forth from the household life to the homeless life, the unsurpassed culmination of the spiritual life, and having personally attained it, he dwelled in it.
He understood: "Birth is ended, the spiritual life has been lived, what had to be done has been done, there is no more coming to any state of being." And the venerable Bhāradvāja became one among the arahants.