四分律比丘含注戒本 3.54

3.54

The Buddha was in Śrāvastī. The group of six wore their nivāsanas untidily, so householders criticized them, saying: "They are like performers and actors joking and laughing at festivals, or like kings and ministers." The bhikṣus reported the fault, and the Buddha thereupon reproached them and laid down the precept.