Sahih Muslim | Book 32 | Hadith Number 6205

Narrated by Anas b. Malik
Anas b. Malik reported Allah's Messenger (may peace be upon him) as saying: Neither nurse mutual hatred, nor jealousy, nor enmity, and become as fellow brothers and servants of Allah. It is not lawful for a Muslim that he should keep his relations estranged with his brother beyond three days.