The verb is 'to prophesy'.
The third person singular form in the present tense is 's/he prophesies' and in the past tense 's/he prophesied'.
THERE IS NO SUCH VERB AS 'TO PROPHESIZE'.
[And breathe]
My students have been getting this wrong for years, but this morning I heard it on Radio 4 : 'he prophesizes'.
So, after screaming at the Radio for 5 minutes, I felt a visit to Pedants' Corner was in order.
Thank you. I feel better now.