Sahih Muslim Book 32, Hadith Number 6209.
Chapter : Forbiddance of nursing mutual jealousy mutual hatred and mutual hostility.
Anas reported Allah’s Apostle (may peace be upon him) as saying: Nurse no grudge, nurse no aversion and do not sever ties of kinship and live like fellow-brothers as servants of Allah. This hadith has been narrated on the authority of Shu’ba with the same chain of transmitters but with this addition: “As Allah has commanded you.”