In DS9 "Destiny", the Third Prophecy of Trakor comes true over the course of the episode.
At the end, Sisko and a Vedic have the following exchange:
YARKA: There are signs that Trakor's fourth prophecy will soon come to pass as well.
SISKO: Don't tell me that has something to do with me?
YARKA: You, Commander? Well, it is a prophecy about the Emissary.
SISKO: Tell me about it.
YARKA: The fourth prophecy says that the Emissary will face a fiery trial and he'll be forced to choose...
Did the fourth prophecy come true? Does Sisko being "forced to choose" correspond to some particular event in any later DS9 episode?