According to biblical tradition, 13 guests attended the Last Supper, held on Maundy Thursday, including Jesus and his 12 apostles (one of whom, Judas, betrayed him). The next day, of course, was Good Friday, the day of Jesus' crucifixion.
The seating arrangement at the Last Supper is believed to have given rise to a longstanding superstition that having 13 guests at a table was a bad omen—specifically, that it was courting death.
Though Friday's negative associations are weaker, some have suggested they also have roots in Christian tradition: Just as Jesus was crucified on a Friday, Friday was also said to be the day Eve gave Adam the fateful apple from the Tree of Knowledge, as well as the day Cain killed his brother, Abel
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Friday 13th myths, legends and origins.
Non-Fictionits the fright full truth about why Friday 13th and the number 13 is such a haunted number and date.