佛說處處經 1.10

1.10

「佛行足去地四寸，有三因緣：一者、見地有虫蟻故；二者、地有生草故；三者、現神足故，亦欲令人意止佛行。

"That when the Buddha walks, his feet are four inches above the ground is due to three nidānas: first, because he sees that there are worms and ants on the ground; second, because there is living grass on the ground; third, to display his riddhipāda, and also wishing to cause people's minds to fix upon the Buddha's gait.