9Hair doth not invalidate your prayer, nor aught from which the spirit hath departed, such as bones and the like. Ye are free to wear the fur of the sable as ye would that of the beaver, the squirrel, and other animals; the prohibition of its use hath stemmed, not from the Qur’án, but from the misconceptions of the divines. He, verily, is the All-Glorious, the All-Knowing.
Bones, fur, hair do not invalidate prayer, 146
What are we free to wear?
In earlier Dispensations what was held to invalidate one’s prayer?