金剛般若經依天親菩薩論贊略釋秦本義記卷上 1.10

1.10

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.