梵網經菩薩戒本疏 3.52

3.52

Third, regarding the sequence: in the previous precept, speaking in reliance on actual faults was still a relatively light failing; here, going beyond their faults to add deprecation is an especially severe failure, which is why it is explained next. Furthermore, among the bodhisattva's four pārājikas, this occupies the first place, and therefore it is distinguished first.