金剛經纂要刊定記 4.318

4.318

一來果。經問答及徵意，皆同上釋。意明斯陀含者，但於人間天上一度往來，雖復往來實無往來之者，只約此義名斯陀含。

The fruit of once-returning. The sūtra's questions, answers, and purports of inquiry are all the same as explained above. The intention clarifies that a sakṛdāgāmin goes and comes only once between the human and celestial realms; although they go and come, there is truly no one who goes or comes; only in terms of this meaning are they called a sakṛdāgāmin.