四分律比丘含注戒本 2.692

2.692

The Buddha was in Śrāvastī. Many bhikṣus assembled to discuss the Dharma and Vinaya. The group-of-six said to one another, "Look at those bhikṣus; it seems they are going to perform a karman against us," and rose from their seats and left. The bhikṣus called them to stay, but they left intentionally. They informed the Buddha of the matter, who rebuked them and instituted the rule.