Sayyiduna Mu'adh bin Jabal (may Allah be pleased with him) said: The Messenger of Allah (peace and blessings be upon him) sent me to Yemen and said: "Perhaps you will pass by my grave and my mosque. I have sent you to a people whose hearts are very soft; they will fight you over the truth twice. So, together with those of them who obey you, fight those who disobey you. Then they will come towards Islam, until a wife will hasten ahead of her husband, a son ahead of his father and a brother ahead of his brother. And settle between the two tribes, al-Sakun and al-Sakasik."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 17795