菩薩戒本疏 1.67

1.67

若佛子！自謗三寶、教人謗三寶，謗因、謗緣、謗法、謗業，而菩薩見外道及以惡人一言謗佛音聲，如三百鉾㓨心，況口自謗，不生信心、孝順心，而反更助惡人、邪見人謗者，是菩薩波羅夷罪。

If a disciple of the Buddha himself slanders the Three Jewels, instructs another to slander the Three Jewels, [produces] causes of slander, conditions of slander, methods of slander, or karma of slander; whereas a bodhisattva, upon seeing a non-Buddhist or an evil person utter even a single sound of slandering the Buddha, feels as if three hundred lances were piercing his heart, how much less could he himself slander with his mouth, failing to generate a faithful mind and a filial mind, and instead further assisting evil people and people of wrong view to slander: this is a bodhisattva's parājika offense.