3,953. Why Four Cubbies?

Hilchos Klei HaMikdash 8:9

They made four cubbies per watch so that the pieces of their uniforms wouldn’t be mixed together. Rather, there was a cubby for breeches that was labeled “breeches,” one for sashes labeled “sash,” and similarly for their hats and tunics.

Hilchos Klei HaMikdash 8:10

The Kohein Gadol left his gold clothes in his chamber at night and whenever he would leave the Temple.