Ruling on prostrating on a garment

Question:
If one prostrates on his garment?

Answer:
It does no harm; if one prostrates on his garment, there is nothing wrong with it.
Q: If one prostrates on thorns?
A: If it causes him pain, some people have rough foreheads; if it causes him pain, there is nothing wrong with it.
Q: Does he raise his head, remove the object, and return to prostration?
A: Yes, he raises his head, removes what caused him pain, and then places his head—his forehead.
Q: Prostrating on a cushion?
A: The best is in the open air. If he is unable, he does not place a cushion or anything else; he gestures with his head if he is unable to prostrate.