妙法蓮華經 2.16

2.16

At that time Śāriputra said to the Buddha: "Bhagavat, I now have no further doubts or regrets, having personally received before the Buddha the vyākaraṇa for anuttarā samyaksambodhi. But these twelve hundred whose minds have attained mastery previously dwelt in the stage of training (śaikṣa), and the Buddha constantly taught and transformed them, saying: 'My Dharma can free one from birth, old age, sickness, and death, reaching ultimate nirvāṇa.' These persons in training (śaikṣa) and beyond training (aśaikṣa) also each thought they had attained nirvāṇa by being free from the view of self, the views of existence and non-existence, and the like; yet now before the Bhagavat they hear what they had never heard before and have all fallen into doubt and confusion. Excellent, Bhagavat! Please explain the causes and conditions for the fourfold assembly, so that they may be freed from doubt and regret."