妙法蓮華經玄義 4.174

4.174

阿那含雖斷五下分結，而不能捨深禪定，來生欲界，和光利物，不同其塵。菩薩能如此，故別受離欲清淨之名。

Although the anāgāmin severs the five lower fetters, they are unable to relinquish deep meditative absorption to take birth in the desire realm, blending their light to benefit beings without being tainted by their dust. The bodhisattva can do so, and therefore specifically receives the name "purity of detachment from desire."