大般涅槃經集解 67.134

67.134

案僧亮曰：第五人，進修思惟，故名行也。僧宗曰：既經初果，觀於四諦，今復行向涉思惟，斷麁貪麁瞋思惟六品也。寶亮曰：第五斯陀含人，為斷三毒故，進修涉道，義如錯魚為食故行也。

Sengliang states: The fifth person advances in cultivating cultivation, hence he is called ‘moving on’. Sengzong states: Having passed through the first fruit and contemplated the four truths, he now moves on again toward cultivation, severing the six coarse grades of greed and coarse anger in cultivation. Baoliang states: The fifth, the sakṛdāgāmin person, advances in traversing the path in order to sever the three poisons, the meaning being like the crocodile fish moving on for the sake of food.