Kitab-i-Aqdas/Elder9

Hair does not make void your worship, nor does that which has been deprived of spirit, such, for example, as bones and other things. [Note 4] Wear sable (sammur) just as you wear silk and squirrel-skin and other things. Indeed, this was not forbidden in the Furqan (i.e. the Qur'an), but the learned ones were uncertain about it. Indeed He is the Knower, the Mighty One.