Anas bin Malik (may Allah be pleased with him) says that whenever the Messenger of Allah (peace and blessings of Allah be upon him) went to the house of Umm Haram bint Milhan, she would feed him. Umm Haram (may Allah be pleased with her) was married to Ubadah bin Samit (may Allah be pleased with him). One day, the Messenger of Allah (peace and blessings of Allah be upon him) went to her, so she fed him and began to look for lice in his head. He fell asleep. Then the Messenger of Allah (peace and blessings of Allah be upon him) woke up, smiling. Umm Haram (may Allah be pleased with her) says: I asked, "O Messenger of Allah! What is making you smile?" He replied, "Some warriors of my Ummah were presented before me; they were riding on the surface of this sea, sitting on thrones, looking like kings." The narrator is in doubt whether he said «ملوك على الأسرة» or «مثل الملوك على الأسرة» . I said, "O Messenger of Allah! Pray to Allah that He makes me among them." So he prayed for her. Then he rested his head and slept again, then woke up smiling. I said, "O Messenger of Allah! What is making you smile?" He said, "Some people of my Ummah were presented before me, fighting in the way of Allah." He said as he had said before. I said, "O Messenger of Allah! Pray to Allah that He makes me among them." He said, "You will be among the first (to fight in jihad on the sea)." Anas (may Allah be pleased with him) says: During the time of Muawiyah bin Abi Sufyan (may Allah be pleased with them), Umm Haram (may Allah be pleased with her) set out on a sea journey (for a jihad), and when she was coming out of the sea, she fell from her mount and died.

Imam Tirmidhi says:
1- This hadith is Hasan Sahih.
2- Umm Haram bint Milhan is the sister of Umm Sulaym and the maternal aunt of Anas bin Malik (and was a close relative from the maternal side of the Prophet Muhammad, peace and blessings of Allah be upon him).