7.
The Discourse on the Evil Monk
218.
"Here I, friend, descending from the Mount Vulture Peak, saw a monk going through the sky.
His double robe was blazing, in flames, aglow; his bowl was blazing, in flames, aglow; his waistband was blazing, in flames, aglow; his body was blazing, in flames, aglow.
He was making a cry of distress... etc.
That, monks, was an evil monk during the teaching of Kassapa, the Perfectly Enlightened One... etc.
The seventh.