It is narrated from Sayyidah Umm Salamah (may Allah be pleased with her) that one day the Messenger of Allah (peace and blessings be upon him) lay down, and when he woke up his heart was heavy, and in his hand was red soil which he was turning over. I said: O Messenger of Allah! What is this soil? He (peace and blessings be upon him) said: "Jibril (peace be upon him) has informed me that this one, meaning Husayn, will be killed in the land of Iraq. So I said to Jibril (peace be upon him): Show me the soil of the land in which he will be killed. And this is its soil."
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 2808