佛說觀佛三昧海經 1.52

1.52

"When he reached eight years of age, his maternal aunt observed again that Siddhārtha had grown older, and the hair between his eyebrows must have grown along with his years. She then tested it by looking, stretching out the white hair. She saw that the hair was straight, like a tube of white lapis lazuli, and from the tip of the hair five-colored brilliant rays issued forth and returned into the pore. The mother was filled with deep affection, her feelings knowing no end, and said to the people: 'My son's hair-mark is even like this!' When the people had seen it, as before it curled to the right, exceedingly lovely. This is called the mark of the white curl during the Bodhisattva's boyhood.