General Behavior (Kitab Al-Adab)
Dawud :: Book 41 : Hadith 4986
Narrated AbdurRahman ibn AbuLayla:
The Companions of the Prophet (peace_be_upon_him) told us that they were travelling with the Prophet (peace_be_upon_him). A man of them slept, and one of them went to the rope which he had with him. He took it, by which he was frightened. The Prophet (peace_be_upon_him) said: It is not lawful for a Muslim that he frightens a Muslim.