四分律比丘含注戒本 2.15

2.15

如上六種罵餘比丘，若面罵、喻罵、自比罵者，墮；說不了，突吉羅。

Reviling other bhikṣus through the above six categories, whether direct reviling, reviling by metaphor, or reviling by comparing oneself—if [the meaning] is clearly expressed, it is an offense of falling [into hell]; if [the meaning] is not clearly expressed, it is a duṣkṛta.