On one occasion, when the monk Upavāḷa was being examined in the midst of the Sangha about an offense, he asserted things after denying them, denied things after asserting them, evaded the issue, and lied. The monks of few desires complained and criticized him, “How can the monk Upavāḷa act like this?” They told the Buddha. … “Is it true, monks, that the monk Upavāḷa is acting like this?” “It’s true, sir.” … After rebuking him … the Buddha gave a teaching and addressed the monks: “Well then, the Sangha should do a legal procedure of further penalty against the monk Upavāḷa.

And it should be done like this. First you should accuse the monk Upavāḷa. He should then be reminded of what he has done, before he’s charged with an offense. A competent and capable monk should then inform the Sangha: ‘Please, venerables, I ask the Sangha to listen. The monk Upavāḷa, while being examined in the midst of the Sangha about an offense, asserted things after denying them, denied things after asserting them, evaded the issue, and lied. If the Sangha is ready, it should do a legal procedure of further penalty against the monk Upavāḷa. This is the motion.