佛說觀佛三昧海經 1.13

1.13

The Buddha told the royal father: "In Jambudvīpa there is a king of lions named Vimala. According to the nature of this lion, only upon completing forty years do the female and male mate. Having once mated, it leaps, roars, rolls over, and throws itself down, yet its body suffers no harm. While that lion's cub is in the womb, it is equal and not different from its father, the king of beasts. Great King, you should know: to expect it while in the womb to be able to roar, leap down, run, and crouch—there is no such thing."