How to spell prophecy
The common mistake made with the word "prophecy" is to write the word "prophesy" in it's place, effectively misspelling the word you meant.
Prophecy (pronounced prof-ess-see) is the correct spelling for the noun – the event or thing in the future.
Prophesy (pronounced prof-ess-eye) is the correct spelling for the verb – the act of making a prediction.
The way to remember which is the correct word to use is to think of the following:
Prophesy is saying
Prophecy is what's coming