It is narrated from Amr bin al-Aswad that he came to Ubadah bin al-Samit (may Allah be pleased with him), who was on the coast of Hims in a building of his, and with him was his wife Umm Haram (may Allah be pleased with her). Amr said: Umm Haram (may Allah be pleased with her) told us that she heard the Messenger of Allah (peace and blessings be upon him) saying: "The first army of my Ummah to fight in jihad on this sea has made Paradise due for itself." Umm Haram (may Allah be pleased with her) said: O Messenger of Allah! Am I one of them? He (peace and blessings be upon him) said: "You are one of them." Then the Messenger of Allah (peace and blessings be upon him) said: "The first army of my Ummah to fight in jihad against the city of Caesar is forgiven." Umm Haram (may Allah be pleased with her) said: O Messenger of Allah! Am I one of them? He (peace and blessings be upon him) said: "No."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 21785