俱舍論記 10.225

10.225

「定謂無間至故名邪定」者，別解定。定謂五無間業，造此業者必墮地獄。此五逆業於邪中定故，故名邪定。若造餘業，雖亦有墮三惡趣者，而非定故。

"Certitude refers to the immediate [karmas] […] therefore it is called wrong certitude": this specifically explains certitude. "Certitude" refers to the five immediate karmas; one who commits this karma must fall into hell. Because these five unpardonable karmas are determinate within what is wrong, they are called wrong certitude. If one commits other karmas, although there are also those who fall into the three miserable destinies, it is not determinate.