Monks, there are these six sense bases.

What six?

The eye, the ear, the nose, the tongue, the body, the mind.

When, Monks, a Noble Disciple understands as they really are the gratification, the danger, and the escape in the case of these six sense bases;

Then he is called a Noble Disciple who is a Stream-Enterer, no longer bound to the nether world, fixed in destiny, with Nibbāna (Enlightenment) as his destination.

(Reference: SN 48.26)

In this Teaching from Gotama Buddha, he shares that a Stream-Enterer will understand The Six Sense Bases.

A Stream-Enterer has not yet escaped The Six Sense Bases as this is described in the fourth fetter/taint/pollution of mind as “sensual desire” but they will understand “as they really are the gratification, the danger, and the escape” from The Six Sense Bases (i.e. sensual desire).

Sensual desire (Elimination of the desire for pleasures from The Six Sense Bases: eyes, ears, nose, tongue, body, and the mind.)