Nothing Is Unbelievable Anymore.
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No best answer has yet been selected by vossyvic. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.I was told at school it's an Old Testament/ Jewish thing. Seven years was a jubilee in the time of the OT. Two times seven years (i.e.14 years) was a time for a special celebration. The 13th year was considered the time when bad things might happen to prevent that celebration, e.g a lousy harvest would mean not enough food for the feast year.