Cammasātaka Jātaka (No.324)
Once a religious mendicant, clad in a leather garment, saw a ram falling back
before him, and imagining that the animal was doing him obeisance, uttered its
praises. The Bodhisatta, who was a merchant, hearing this, warned the ascetic
that the ram was only preparing to attack him, and even as he was speaking the
animal charged the mendicant and felled him to the ground.
The story was related in reference to a monk of Sāvatthi, to whom a similar
thing happened while he was wearing a leather jerkin. J. iii.82ff