en_tn/rev/22/14.md

wash their robes...eat from the tree of life

people who are spiritually clean are able to enjoy the fruits of eternal life - living with God forever. (See: rc://en/ta/man/translate/figs-metaphor)

Outside

This means they are outside the city and not allowed to enter.

are the dogs

In that culture the dog was an unclean and despised animal. It represents people who are wicked.