Khuddakavatthukkhandhaka

Vinayapiṭaka · Cūḷavagga (2) · Vol. 7 · Section 42

[42] Now at that time bhikkhus placed their bowls on the edge of a ledge (miḍḍha). Having rolled over, a bowl broke. They reported this matter to the Blessed One. … "Bhikkhus, a bowl should not be placed on the edge of a ledge. Whoever should so place one commits an offense of wrong-doing (dukkaṭa)."

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 2 other places