Sayyiduna Anas bin Malik (may Allah be pleased with him) said: The angel of rain asked permission from his Lord, the Mighty and Majestic, to visit the Prophet (peace and blessings be upon him), and Allah gave him permission. So he came to him (peace and blessings be upon him) while he was in the house of Sayyidah Umm Salamah, and he (peace and blessings be upon him) said: "O Umm Salamah! Guard the door for us; let no one come in to us." While she was at the door, Sayyiduna Husayn came, opened the door, and began climbing onto the back of the Prophet (peace and blessings be upon him), and the Prophet (peace and blessings be upon him) was embracing him and kissing him. The angel said to him (peace and blessings be upon him): Do you love him, O Muhammad? He (peace and blessings be upon him) said: "Yes." He said: Listen, your Ummah will kill him, and if you wish, I will show you the soil of the place where he will be killed. The narrator said: So he took a handful from the place where he would be killed and brought him soft red earth, and Sayyidah Umm Salamah (may Allah be pleased with her) took it and placed it in her garment. Thabit said: "We used to say that it was the soil of Karbala."
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 2800