The Office of the Judge (Kitab Al-Aqdiyah)

Dawud :: Book 24 : Hadith 3628

Narrated AbuSirmah:

The Prophet (peace_be_upon_him) said: If anyone harms (others), Allah will harm him, and if anyone shows hostility to others, Allah will show hostility to him.

Source materials are from the University of Southern California MSA site
Hadith eBooks converted from Imaan Star