What is the superstition about 13 people eating dinner together?

The superstition surrounding 13 people dining together stems from the idea that it brings bad luck, often linked to the Last Supper where Jesus dined with his 12 apostles, making a total of 13. This belief is particularly strong in Western cultures, where it is thought that if 13 people gather for a meal, one of them may die within the year. This superstition has led some to avoid having 13 guests at dinner parties or to take precautions, such as adding a 14th guest, to ward off the perceived bad luck.