Sayyiduna Iyad bin Himar (may Allah be pleased with him) says: "O Messenger of Allah! A lowly man of my people reviles me." He (peace and blessings be upon him) said: "Two people who revile each other are two devils; they rail against each other and tell lies against each other, and the sin falls on the one who started it, as long as the wronged one does not transgress."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الشهادات / 21087