Udāna 5.9

Saddhāyamānasuttaṃ 49

The Discourse about Mocking

Thus I heard: At one time the Gracious One was walking on walking tour amongst the Kosalans, together with a great Community of monks. Then at that time a great many young brāhmaṇas were passing by not far from the Gracious One in a mocking manner. The Gracious One saw those many young brāhmaṇas passing by not far away in a mocking manner.

Then the Gracious One, having understood the significance of it, on that occasion uttered this exalted utterance:

“The forgetful, speaking unsuitable words, though appearing to be wise,
Stretching their mouths as much as they want, are led on by what they don’t understand.”