Crimson Pilgrim

Crimson Pilgrims are humans found wandering in the floating city of Dalaran during the Burning Legion's third invasion.

Quotes
When encountering a priest equipped with Light's Wrath:
 * say
 * say
 * say
 * say
 * say

Speculation
Considering their reaction to someone equipped with Light's Wrath, and their attire, they may be members or former members of the Scarlet Crusade, or even the elite Crimson Legion.