Did Umm Salamah (may Allah be pleased with her) say, "Muhammad (peace and blessings of Allah be upon him) has disavowed whoever divides his religion and forms factions," and if so, in which books of Hadith was it reported?

The hadith is narrated by Abdullah ibn Ahmad from his father in the book Al-Ilal, and it states that Al-Hasan witnessed Uthman being pelted with stones, and he heard the Mother of Believers (the correct name is Umm Salamah) say: "Indeed, your Prophet, peace and blessings be upon him, has disavowed whoever divides his religion and forms factions." The inclusion of this hadith in Al-Ilal suggests its weakness.