It is narrated from Sayyiduna Abu Umamah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said to Sayyiduna Abu Ayyub bin Zayd (may Allah be pleased with him): "O Abu Ayyub, shall I not guide you to a deed that Allah and His Messenger are pleased with?" He said: Certainly. He (peace and blessings be upon him) said: "Make peace between people when their relations go bad, and bring them close together when they drift apart."
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 7968