It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that he said: The Prophet (peace and blessings be upon him) reclined at the house of Bint Milhan (may Allah be pleased with her) and dozed off, then he woke up laughing. I said: O Messenger of Allah! Why are you laughing? He (peace and blessings be upon him) said: "Because of some people of my Ummah who will ride upon this green sea to fight in jihad; their likeness is that of kings seated on thrones." I said: O Messenger of Allah! Pray to Allah to make me one of them. He (peace and blessings be upon him) said: "You are one of them." So she married Ubadah bin al-Samit (may Allah be pleased with him) and went out with Ibn Qurtah. When she mounted, her mount threw her, and she died, and then she was buried.
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 21784