金剛般若經依天親菩薩論贊略釋秦本義記卷上 1.10

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經。洗足已者。第二清身業也。仙記云。如來行時地神化花以承其足。離地四指為眾生故。途行示污足故。教入定示清身業也。

Sūtra: Having washed his feet. / Second, this purifies bodily karma. The *Notes of the Immortals* states: When the Tathāgata walked, the earth spirits transformed flowers to support his feet four finger-breadths off the ground. For the sake of sentient beings, he manifested soiled feet while traveling on the road; thus, teaching the entry into concentration, he manifested the purification of bodily karma.