大毘盧遮那經供養次第法疏 1.28

1.28

The passage from "placing the right knee on the ground" onward is the mantra gate of the upāya of expelling transgressions. Reciting the mantra is the same as before. The wisdom of dharmatā is naturally without transgression; if one clings to the existence of transgression, this wisdom enables one to understand that there is no transgression, and therefore it is called expelling transgressions.