3. 波斯黃道十二宮的傳說
　　Ancient Persians believed the twelve constellations in the Zodiac controlled the months of the year, and each ruled the earth for a thousand years at the end of which the sky and earth collapsed in chaos. Therefore, the thirteenth is identified with chaos and the reason Persians leave their houses to avoid bad luck on the thirteenth day of the Persian Calendar, a tradition called Sizdah Bedar.
　　古代的波斯人相信天空中的黃道十二星座掌控著一年的十二個月，而每個星座會統治地球一千年。等到十二個輪回結束，天空和大地就會崩塌。因此，第十三就和混亂聯系了起來。波斯人在波斯歷上的第十三天會外出、以避免厄運，這個傳統被稱為“Sizdah Bedar”，意思是“十三戶外”。
　　However, the number 13 is not uniformly bad in the Judeo-Christian tradition. For example, the 13 attributes of God (also called the thirteen attributes of mercy) are enumerated in the Torah. Some modern Christian churches also use 13 attributes of God in sermons.
　　除此以外，不吉利的13還有很多傳聞，包括漢莫拉比法典(code of Hummurabi)的第13條法規、十字軍東征時的13圓桌騎士以及Friday the 13th（十三號星期五）等等。不過，也不是所有基督教傳統的國家都認為13是不吉利的，在某些基督教祭典中還有13信條的儀式：