Answer:
What has thousands of ribs and two backbones?
What begins to die on a wedding day?
What can go up but never come down?
I am not alive, though I never die, to no one I've ever told a lie, today I can be god's warrior, and serve him with no horror, but tomorrow I might be devil's knight, for I am what ends the light.
What Can Fly Without Wings
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?