Sunan Abi Dawud — General Behavior (Kitab Al-Adab) — Hadith No: 4910
Translation
Anas b. Malik reported the Messenger of Allah (May peace be upon him) as saying:Do not hate each other; do not envy each other; do not desert each other; and be the servants of Allah as brethren. It is not allowed for a Muslim to keep apart from his brother for more than three days