Is it permissible to claim that the rulings on shaking hands are specific to the Prophet (peace and blessings be upon him) and not the Ummah, such as the prohibition of shaking hands with women?

Question:
May Allah reward you. Honorable Shaykh, this questioner says that the prohibition of shaking hands with women is specific to the Prophet (peace and blessings be upon him).

Answer:
Yes, if everything were specific to the Prophet (peace and blessings be upon him), we would have nothing. The default is generality, unless evidence indicates specification, in which case that is followed. If there is no evidence indicating specification, the default is that it is general for the Ummah. Yes.