Is it permissible to prostrate on one's forehead contact point (Sadgh) if one is incapable of touching the ground with it?
Chapter on the Times When Prayer is Prohibited
Al-Mughni
Book of Prayer
Primary text
If one is capable of prostrating on their forehead contact point, they must not prostrate only on other facial parts, as the forehead contact point is one of the obligatory limbs of prostration.