At Sāvatthi.

"I will teach you the diversity of elements, bhikkhus. Listen to it and pay close attention, I will speak."

"Yes, venerable sir," those bhikkhus replied to the Blessed One. The Blessed One said:

"And what, bhikkhus, is the diversity of elements?

The eye element, the form element, and the eye-consciousness element; the ear element, the sound element, and the ear-consciousness element; the nose element, the odor element, and the nose-consciousness element; the tongue element, the taste element, and the tongue-consciousness element; the body element, the touch element, and the body-consciousness element; the mind, the mental objects, and the mind-consciousness element.

This, bhikkhus, is called the diversity of elements."