佛祖統紀 34.32

34.32

如來既成道已轉正法輪。初頓後漸則有五時。華嚴名頓教。鹿苑方等般若名三漸。法華涅槃為非頓非漸。

After realizing the Way, the Tathāgata turned the wheel of the true Dharma. Beginning with the sudden and proceeding to the gradual, there were five periods. The Avataṃsaka is named the Sudden Teaching. The Deer Park, Vaipulya, and Prajñā are named the three gradual [teachings]. The Lotus and Nirvāṇa are neither sudden nor gradual.