Mukhtasar Bukhari

Narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that the Messenger of Allah (peace and blessings of Allah be upon him) said: "Do not harbor malice and envy among yourselves, and do not cut off mutual relations, but be servants of Allah and brothers to each other. And it is not permissible for any Muslim to remain apart from his (Muslim) brother for more than three days due to any dispute."