俱舍論疏 16.171

16.171

論「若以染心至業道方成」，釋麁惡語。一以染心、二發非愛語毀呰於他、三前人解義、四不誤，所罵解時，成其業道。

On the Śāstra's statement: "If with a defiled mind... only then is the path of karma completed": Explaining harsh speech. First, with a defiled mind; second, uttering unpleasant words to revile another; third, the other person understands the meaning; fourth, without error; when the one who is scolded understands, it constitutes its path of karma.