It is narrated from Yahya bin Sa'id that Sayyidah Ruqayyah (may Allah be pleased with her), the daughter of the Messenger of Allah (peace and blessings be upon him), passed away, and Sayyiduna Uthman (may Allah be pleased with him) married Sayyidah Umm Kulthum (may Allah be pleased with her), the (other) daughter of the Messenger of Allah (peace and blessings be upon him). This hadith is sahih (authentic) on the condition of the two Shaykhs, but they did not record it.