The Long Āgama Sūtra 8.27

8.27

「彼苦行者，懈墮憙忘，不習禪定，無有智慧，猶如禽獸，是為垢穢；彼苦行者，貴高，憍慢、增上慢，是為垢穢；彼苦行者，無有信義，亦無反復，不持淨戒，不能精勤受人訓誨，常與惡人以為伴黨，為惡不已，是為垢穢；彼苦行者，多懷瞋恨，好為巧偽，自怙己見，求人長短，恒懷邪見，與邊見俱，是為垢穢。云何，尼俱陀！如此行者可言淨不邪？」

“Those practitioners of asceticism are lazy, forgetful, and don’t train in meditative concentration. They lack wisdom like animals. This is a defilement.

“Those practitioners of asceticism are conceited, proud, and arrogant. This is a defilement.

“Those practitioners of asceticism lack trustworthiness, nor do they repay favors. They don’t observe pure precepts and aren’t able to diligently accept other’s instruction. They associate with bad people, consider them comrades, and don’t stop doing bad things. This is a defilement.

“Those practitioners of asceticism often harbor resentment, favor being deceitful, depend on their own views, look for the faults of others, and harbor long-standing wrong and extreme views. This is a defilement.

“How is it, Nigrodha? Can these practices be called pure and not wrong?”