俱舍論頌疏論本 15.27

15.27

由易地退等者，明二緣捨：一、易地捨，謂從下地生上地時，捨下地法也。或上地沒生下地時，捨上地法也。二、由得退，謂獲勝定，還退失時。頌言等者，等取捨眾同分，亦捨少分殊勝善根。少分殊勝善根者，唯煖等四，名殊勝善。若異生捨，命終時捨，或生當地，或生上地，皆捨煖等。既當地捨，故非易地，以易地捨唯上下故。明捨定戒由上三緣。如色界定由易地退捨，捨無色定亦如此也。唯無律儀與色界異。

'Through changing levels, falling away, and so forth' explains relinquishment through two conditions. 1. Relinquishing through changing levels: when born into a higher level from a lower level, one relinquishes the dharmas of the lower level; or when dying in a higher level and born into a lower level, one relinquishes the dharmas of the higher level. 2. Through falling away: when having obtained superior absorption, one falls back and loses it. The word 'and so forth' in the verse includes relinquishing the nikāyasabhāga, and also relinquishing a small portion of superior roots of good. 'A small portion of superior roots of good' refers only to the four [aids to penetration], Heat and so forth, which are called superior wholesome [dharmas]. If an ordinary worldling relinquishes them, they are relinquished at the time of death; whether born in that same level or born in a higher level, one relinquishes Heat and so forth. Since they are relinquished in that same level, it is not changing levels, because relinquishing by changing levels is only between higher and lower. This explains relinquishing the absorption vows through the above three conditions. Just as absorption of the form realm is relinquished through changing levels and falling away, relinquishing formless absorptions is also like this; the only difference from the form realm is that there are no vows.