大毘盧遮那經供養次第法疏 1.33

1.33

「我今勸請諸如來」以下，第七勸請方便真言門，頌真言同前。真智大悲恒利物，利物故降法雨。至誠念誦此真言，令請法住世，故云勸請。

From "I now entreat all Tathāgatas" onward is the seventh, the mantra gate of the upāya of entreaty; the verses and mantra are the same as before. True wisdom and great compassion constantly benefit sentient beings; because they benefit sentient beings, they rain down the rain of the Dharma. Reciting this mantra with utmost sincerity causes one to entreat the Dharma to remain in the world, and therefore it is called entreaty.