首楞嚴義疏注經 8.449

8.449

身口意，六根之三也。殺盜婬，十因之三也。如身具作殺等三罪，口意不作又輕於前，入十八獄。

Body, speech, and mind are three of the six faculties. Killing, stealing, and lust are three of the ten causes. As when the body completely commits the three sins of killing and so forth, while speech and mind do not commit them, it is again lighter than the former, and one enters the eighteen hells.