It is narrated from Hazrat Abu Darda (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: Shall I not tell you of an act that is superior in rank to prayer, fasting, and zakat? The companions said: Why not? The Prophet (peace and blessings be upon him) said: Reconciling between people who have fallen apart, for causing discord and corruption among such people is the shaver (that shaves off religion).
Hadith Referenceمسند احمد / من مسند القبائل / 27508