華嚴經探玄記 5.60

5.60

四口業中語言，與前何別者？前約報體、後約業用故別也。實論口體屬身分攝，但取能發語邊名語、所發語法名語業，是故新翻為語業，古譯就相名口也。作無作是語業體中表無表義也。

Fourth, in speech karma, how does spoken language differ from the preceding? The preceding was with reference to the retributive body, while the latter is with reference to karmic function; hence they differ. In reality, the body of the mouth is subsumed under parts of the body; taking only the aspect capable of producing speech is called speech, while the dharma of the speech produced is called speech karma. Therefore the new translation renders it "speech karma" (vāg-karman), whereas the old translation named it "mouth" in according with its visible aspect. Expressive and unexpressive refer to the meanings of informative (vijñapti) and uninformative (avijñapti) within the substance of speech karma.