The word for "left" did not have the "sinister" (the Latin word) nature it acquired later, but was from a term from "favored" or "honored" in Greek. These two adjectives are plural, each referring to places, not just a place.
The important tense here is the past perfect tense of the word "prepared." Indicating that this was completed in the past, in this case, as a commitment to others.
Christ's Words in Matthew as a Guide to 40 Days of Prayer.