Shurahbil bin Shuf'ah (may Allah have mercy on him) said: The plague broke out in Syria, and Sayyiduna Amr (may Allah be pleased with him) stood up and said: This filth (epidemic) has descended, so disperse far away from it. Ibn Hasanah (may Allah be pleased with him) said: I accompanied the Messenger of Allah (peace and blessings be upon him), and he (Amr) is more astray than his family's donkey. It is only the mercy of your Lord, the supplication of your Prophet, and the death of the righteous before you, so gather together for it, and do not disperse from it. This reached Amr (may Allah be pleased with him), and he said: He has spoken the truth.
Hadith Referenceالمعجم الكبير للطبراني / باب الشين / 7179