俱舍論頌疏論本 25.17

25.17

釋曰：退有三者，一已得退，謂退已得殊勝功德法故。二未得退，謂約未得殊勝功德，即名為退故。三受用退，謂已得功德，於受用時不現在前，名為退也。

Explanation: "Falling away is threefold": First, falling away from what has been obtained, meaning falling away from dharmas of superior merit already obtained. Second, falling away from what is yet unobtained, meaning that with respect to superior merit not yet obtained, it is termed 'falling away'. Third, falling away from enjoyment, meaning that although merit has been obtained, at the time of enjoyment it does not manifest before one; this is called 'falling away'.