僧羯磨 3.129

3.129

爾時佛問諸比丘：「汝云何學？云何為學？」諸比丘白佛言：「大德是法之根本，為法之主，如世尊向所說，我等受持，故言學。復有三學：增戒學、增心學、增慧學，學此三學，得須陀洹、斯陀含、阿那含、阿羅漢果，是故當勤精進，學此三學。」

At that time, the Buddha asked the bhikṣus: "How do you train? What is training?" The bhikṣus said to the Buddha: "The Bhadanta is the root of the Dharma and the master of the Dharma. We uphold what the World-Honoured One has just spoken; therefore it is called 'training.' Furthermore, there are three trainings: the higher training in morality, the higher training in mind, and the higher training in wisdom. By training in these three trainings, one attains the fruits of srotāpanna, sakṛdāgāmin, anāgāmin, and arhat. Therefore, one should strive with diligence and train in these three trainings."