January 6 is the end of Christmas, which began on December 25, which was reflected in the Feast of Revelation. The holiday of Revelation has other interesting names, such as the 12th night, because it falls on the 12th day after Christmas.
The source of the holiday is in Orthodox Christianity. The Orthodox Christians in Israel are accustomed to immerse themselves in the Jordan River on this day, near the place where Jesus was baptized by John the Baptist in the area of Qasr al-Yahud.
According to tradition, on this day the three kings came to Bethlehem and then God revealed them in the image of Jesus, when a white dove came down from heaven.