It is narrated from Sayyida Aisha (may Allah be pleased with her) that among those who spread the accusation were mentioned the names of Hassaan bin Thabit, Mistah bin Uthatha, and Hamnah bint Jahsh (may Allah be pleased with them). There were others involved as well, but I do not know them. In any case, it was a group, as Allah Almighty has used the word "Usbah" in these verses. The greatest share was that of Abdullah bin Ubayy bin Salool. Urwah says that Sayyida Aisha (may Allah be pleased with her) used to dislike that Sayyiduna Hassaan (may Allah be pleased with him) be spoken ill of in her presence, and she used to say that Hassaan (may Allah be pleased with him) is the one who said: "So indeed, my father and his father and my honor are a protection for the honor of Muhammad (peace and blessings be upon him) from you."