Islamic Interpretation of Dreams (Ibn-i Sirin):
Receiving a threat in a dream means victory over one’s assailant, opponent, or adversary, or it could mean developing a defence mechanism against any danger from that side.
If the threat comes from an unknown person, such a person is a Satan, particularly if the threat is directed against one’s prayers, charitable actions, or devotion.
A threat in a dream also represents the trials of a love story.
(Also see Slapping on the cheek)