Abu 'l-Darda' reported that the Prophet (Peace and blessing of Allah be upon him) said: "Shall I tell you of something that ranks higher than observing prayer or fasting or giving charity? "His Companions replied: "Yes." He said: "It is restoring relations between people, because severing them is fatal."

Imam al-Bukhari, Moral Teachings of Islam by Imam al-Bukhari, Abdul Ali Hamid, translator