General Behavior (Kitab Al-Adab)
Dawud :: Book 41 : Hadith 5190
Narrated AbuJurayy al-Hujaymi:
I came to the Prophet (peace_be_upon_him) and said: Upon you be peace, Apostle of Allah! He said: Do not say: Upon you be peace, for "Upon you be peace" is the salutation to the dead.